Note 4 - Loans Receivable - Risk Categories of Loans By Class of Loans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Loans receivable	$ 768,646		$ 768,646		$ 895,157
Current period recoveries, total	10	$ 28	35	$ 55
Current period gross charge-offs, total	(102)	$ (743)	(582)	$ (936)
Real Estate Portfolio [Member] \| One-to-Four Family Residential Real Estate [Member]
Loans receivable	12,859		12,859		14,829
Financing Receivable, current year	351		351		0
Financing Receivable, one year before	0		0		484
Financing Receivable, two years before	480		480		0
Financing Receivable, three years before	0		0		0
Financing Receivable, four years before	0		0		34
Financing Receivable, prior	9,136		9,136		11,089
Financing Receivable, revolving	2,892		2,892		3,222
Current period recoveries, current year			0		0
Current period recoveries, one year before			0		0
Current period recoveries, two years before			0		0
Current period recoveries, three years before			0		0
Current period recoveries, four years before			0		0
Current period recoveries, prior			8		28
Current period recoveries, revolving			0		0
Current period recoveries, total			8		28
Real Estate Portfolio [Member] \| Multi-family Mortgage [Member]
Loans receivable	486,050		486,050		521,957
Financing Receivable, current year	8,420		8,420		33,812
Financing Receivable, one year before	32,511		32,511		38,444
Financing Receivable, two years before	33,624		33,624		204,590
Financing Receivable, three years before	188,345		188,345		107,420
Financing Receivable, four years before	100,652		100,652		55,129
Financing Receivable, prior	118,014		118,014		76,940
Financing Receivable, revolving	4,484		4,484		5,622
Current period recoveries, current year			0		0
Current period recoveries, one year before			0		0
Current period recoveries, two years before			0		0
Current period recoveries, three years before			0		0
Current period recoveries, four years before			0		0
Current period recoveries, prior			8		18
Current period recoveries, revolving			0		0
Current period recoveries, total			8		18
Current period gross charge-offs			0		0
Current period gross charge-offs, one year before			0		0
Current period gross charge-offs, two years before			0		(5)
Current period gross charge-offs, three years before			(297)		0
Current period gross charge-offs, four years before			0		0
Current period gross charge-offs, prior			0		0
Current period gross charge-offs, revolving			0		0
Current period gross charge-offs, total			(297)		(5)
Net period recoveries (charge offs), current year			0		0
Net period recoveries (charge offs), one year before			0		0
Net period recoveries (charge offs), two years before			0		(5)
Net period recoveries (charge offs), three years before			(297)		0
Net period recoveries (charge offs), four years before			0		0
Net period recoveries (charge offs), prior			8		18
Net period recoveries (charge offs), revolving			0		0
Current period gross charge-offs (recovery), net			(289)
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery (Writeoff), Net					13
Real Estate Portfolio [Member] \| Nonresidential Real Estate [Member]
Loans receivable	98,804		98,804		108,153
Financing Receivable, current year	1,074		1,074		16,760
Financing Receivable, one year before	12,322		12,322		14,355
Financing Receivable, two years before	14,015		14,015		47,580
Financing Receivable, three years before	46,089		46,089		14,771
Financing Receivable, four years before	13,994		13,994		7,335
Financing Receivable, prior	10,302		10,302		6,439
Financing Receivable, revolving	1,008		1,008		913
Commercial Portfolio Segment [Member]
Loans receivable	169,335		169,335		248,595
Financing Receivable, current year	15,146		15,146		27,360
Financing Receivable, one year before	20,382		20,382		32,572
Financing Receivable, two years before	20,412		20,412		87,396
Financing Receivable, three years before	52,178		52,178		30,804
Financing Receivable, four years before	16,311		16,311		10,131
Financing Receivable, prior	1,398		1,398		723
Financing Receivable, revolving	43,508		43,508		59,609
Current period recoveries, current year			0		0
Current period recoveries, one year before			0		0
Current period recoveries, two years before			8		1
Current period recoveries, three years before			7		5
Current period recoveries, four years before			0		7
Current period recoveries, prior			2		1
Current period recoveries, revolving			0		0
Current period recoveries, total			17		14
Current period gross charge-offs			(11)		0
Current period gross charge-offs, one year before			(88)		(332)
Current period gross charge-offs, two years before			(11)		(4,998)
Current period gross charge-offs, three years before			(142)		(44)
Current period gross charge-offs, four years before			(6)		(493)
Current period gross charge-offs, prior			0		0
Current period gross charge-offs, revolving			(1)		0
Current period gross charge-offs, total			(259)		(5,867)
Net period recoveries (charge offs), current year			(11)		0
Net period recoveries (charge offs), one year before			(88)		(332)
Net period recoveries (charge offs), two years before			(3)		(4,997)
Net period recoveries (charge offs), three years before			(135)		(39)
Net period recoveries (charge offs), four years before			(6)		(486)
Net period recoveries (charge offs), prior			2		1
Net period recoveries (charge offs), revolving			(1)		0
Current period gross charge-offs (recovery), net			(242)
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery (Writeoff), Net					(5,853)
Consumer Portfolio Segment [Member]
Loans receivable	1,598		1,598		1,623
Financing Receivable, current year	195		195		790
Financing Receivable, one year before	573		573		169
Financing Receivable, two years before	142		142		3
Financing Receivable, three years before	3		3		20
Financing Receivable, four years before	0		0		49
Financing Receivable, prior	0		0		0
Financing Receivable, revolving	685		685		592
Current period recoveries, current year			0		0
Current period recoveries, one year before			0		0
Current period recoveries, two years before			0		0
Current period recoveries, three years before			0		0
Current period recoveries, four years before			0		0
Current period recoveries, prior			0		0
Current period recoveries, revolving			2		1
Current period recoveries, total			2		1
Current period gross charge-offs			0		0
Current period gross charge-offs, one year before			0		0
Current period gross charge-offs, two years before			0		0
Current period gross charge-offs, three years before			0		0
Current period gross charge-offs, four years before			0		0
Current period gross charge-offs, prior			0		0
Current period gross charge-offs, revolving			(26)		(44)
Current period gross charge-offs, total			(26)		(44)
Net period recoveries (charge offs), current year			0		0
Net period recoveries (charge offs), one year before			0		0
Net period recoveries (charge offs), two years before			0		0
Net period recoveries (charge offs), three years before			0		0
Net period recoveries (charge offs), four years before			0		0
Net period recoveries (charge offs), prior			0		0
Net period recoveries (charge offs), revolving			(24)		(43)
Current period gross charge-offs (recovery), net			(24)
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery (Writeoff), Net					(43)
Pass [Member]
Loans receivable	747,406		747,406		866,318
Pass [Member] \| Real Estate Portfolio [Member] \| One-to-Four Family Residential Real Estate [Member]
Loans receivable	12,425		12,425		14,485
Financing Receivable, current year	70		70		0
Financing Receivable, one year before	0		0		484
Financing Receivable, two years before	480		480		0
Financing Receivable, three years before	0		0		0
Financing Receivable, four years before	0		0		34
Financing Receivable, prior	9,067		9,067		10,897
Financing Receivable, revolving	2,808		2,808		3,070
Pass [Member] \| Real Estate Portfolio [Member] \| Multi-family Mortgage [Member]
Loans receivable	477,584		477,584		515,478
Financing Receivable, current year	8,420		8,420		33,812
Financing Receivable, one year before	32,511		32,511		38,228
Financing Receivable, two years before	33,624		33,624		199,495
Financing Receivable, three years before	184,506		184,506		107,420
Financing Receivable, four years before	96,700		96,700		55,129
Financing Receivable, prior	117,339		117,339		75,772
Financing Receivable, revolving	4,484		4,484		5,622
Pass [Member] \| Real Estate Portfolio [Member] \| Nonresidential Real Estate [Member]
Loans receivable	97,614		97,614		106,891
Financing Receivable, current year	1,074		1,074		16,760
Financing Receivable, one year before	12,322		12,322		14,355
Financing Receivable, two years before	14,015		14,015		46,759
Financing Receivable, three years before	46,089		46,089		14,771
Financing Receivable, four years before	13,994		13,994		7,335
Financing Receivable, prior	9,112		9,112		5,998
Financing Receivable, revolving	1,008		1,008		913
Pass [Member] \| Commercial Portfolio Segment [Member]
Loans receivable	158,193		158,193		227,851
Financing Receivable, current year	15,146		15,146		27,360
Financing Receivable, one year before	20,382		20,382		32,517
Financing Receivable, two years before	20,374		20,374		72,546
Financing Receivable, three years before	42,946		42,946		30,764
Financing Receivable, four years before	16,275		16,275		9,973
Financing Receivable, prior	1,397		1,397		723
Financing Receivable, revolving	41,673		41,673		53,968
Pass [Member] \| Consumer Portfolio Segment [Member]
Loans receivable	1,590		1,590		1,613
Financing Receivable, current year	195		195		788
Financing Receivable, one year before	572		572		169
Financing Receivable, two years before	142		142		3
Financing Receivable, three years before	3		3		20
Financing Receivable, four years before	0		0		49
Financing Receivable, prior	0		0		0
Financing Receivable, revolving	678		678		584
Special Mention [Member]
Loans receivable	5,583		5,583		7,446
Special Mention [Member] \| Real Estate Portfolio [Member] \| One-to-Four Family Residential Real Estate [Member]
Loans receivable	281		281		0
Financing Receivable, current year	281		281
Financing Receivable, one year before	0		0
Financing Receivable, two years before	0		0
Financing Receivable, three years before	0		0
Financing Receivable, four years before	0		0
Financing Receivable, prior	0		0
Financing Receivable, revolving	0		0
Special Mention [Member] \| Real Estate Portfolio [Member] \| Multi-family Mortgage [Member]
Loans receivable	4,514		4,514		3,858
Financing Receivable, current year	0		0		0
Financing Receivable, one year before	0		0		0
Financing Receivable, two years before	0		0		3,858
Financing Receivable, three years before	3,839		3,839		0
Financing Receivable, four years before	0		0		0
Financing Receivable, prior	675		675		0
Financing Receivable, revolving	0		0		0
Special Mention [Member] \| Real Estate Portfolio [Member] \| Nonresidential Real Estate [Member]
Loans receivable	782		782		428
Financing Receivable, current year	0		0		0
Financing Receivable, one year before	0		0		0
Financing Receivable, two years before	0		0		428
Financing Receivable, three years before	0		0		0
Financing Receivable, four years before	0		0		0
Financing Receivable, prior	782		782		0
Financing Receivable, revolving	0		0		0
Special Mention [Member] \| Commercial Portfolio Segment [Member]
Loans receivable	1		1		3,156
Financing Receivable, current year	0		0		0
Financing Receivable, one year before	0		0		0
Financing Receivable, two years before	0		0		0
Financing Receivable, three years before	0		0		0
Financing Receivable, four years before	0		0		0
Financing Receivable, prior	0		0		0
Financing Receivable, revolving	1		1		3,156
Special Mention [Member] \| Consumer Portfolio Segment [Member]
Loans receivable	5		5		4
Financing Receivable, current year	0		0		0
Financing Receivable, one year before	0		0		0
Financing Receivable, two years before	0		0		0
Financing Receivable, three years before	0		0		0
Financing Receivable, four years before	0		0		0
Financing Receivable, prior	0		0		0
Financing Receivable, revolving	5		5		4
Substandard [Member]
Loans receivable	6,415		6,415		4,459
Substandard [Member] \| Real Estate Portfolio [Member] \| One-to-Four Family Residential Real Estate [Member]
Loans receivable	141		141		218
Financing Receivable, current year	0		0		0
Financing Receivable, one year before	0		0		0
Financing Receivable, two years before	0		0		0
Financing Receivable, three years before	0		0		0
Financing Receivable, four years before	0		0		0
Financing Receivable, prior	69		69		81
Financing Receivable, revolving	72		72		137
Substandard [Member] \| Real Estate Portfolio [Member] \| Multi-family Mortgage [Member]
Loans receivable	3,952		3,952		1,168
Financing Receivable, current year	0		0		0
Financing Receivable, one year before	0		0		0
Financing Receivable, two years before	0		0		0
Financing Receivable, three years before	0		0		0
Financing Receivable, four years before	3,952		3,952		0
Financing Receivable, prior	0		0		1,168
Financing Receivable, revolving	0		0		0
Substandard [Member] \| Real Estate Portfolio [Member] \| Nonresidential Real Estate [Member]
Loans receivable	408		408		441
Financing Receivable, current year	0		0		0
Financing Receivable, one year before	0		0		0
Financing Receivable, two years before	0		0		0
Financing Receivable, three years before	0		0		0
Financing Receivable, four years before	0		0		0
Financing Receivable, prior	408		408		441
Financing Receivable, revolving	0		0		0
Substandard [Member] \| Commercial Portfolio Segment [Member]
Loans receivable	1,911		1,911		2,628
Financing Receivable, current year	0		0		0
Financing Receivable, one year before	0		0		0
Financing Receivable, two years before	0		0		103
Financing Receivable, three years before	76		76		40
Financing Receivable, four years before	0		0		0
Financing Receivable, prior	1		1		0
Financing Receivable, revolving	1,834		1,834		2,485
Substandard [Member] \| Consumer Portfolio Segment [Member]
Loans receivable	3		3		4
Financing Receivable, current year	0		0		0
Financing Receivable, one year before	1		1		0
Financing Receivable, two years before	0		0		0
Financing Receivable, three years before	0		0		0
Financing Receivable, four years before	0		0		0
Financing Receivable, prior	0		0		0
Financing Receivable, revolving	2		2		4
Substandard Nonaccrual [Member]
Loans receivable	9,242		9,242		16,934
Substandard Nonaccrual [Member] \| Real Estate Portfolio [Member] \| One-to-Four Family Residential Real Estate [Member]
Loans receivable	12		12		126
Financing Receivable, current year	0		0		0
Financing Receivable, one year before	0		0		0
Financing Receivable, two years before	0		0		0
Financing Receivable, three years before	0		0		0
Financing Receivable, four years before	0		0		0
Financing Receivable, prior	0		0		111
Financing Receivable, revolving	12		12		15
Substandard Nonaccrual [Member] \| Real Estate Portfolio [Member] \| Multi-family Mortgage [Member]
Loans receivable	0		0		1,453
Financing Receivable, current year					0
Financing Receivable, one year before					216
Financing Receivable, two years before					1,237
Financing Receivable, three years before					0
Financing Receivable, four years before					0
Financing Receivable, prior					0
Financing Receivable, revolving					0
Substandard Nonaccrual [Member] \| Real Estate Portfolio [Member] \| Nonresidential Real Estate [Member]
Loans receivable	0		0		393
Financing Receivable, current year					0
Financing Receivable, one year before					0
Financing Receivable, two years before					393
Financing Receivable, three years before					0
Financing Receivable, four years before					0
Financing Receivable, prior					0
Financing Receivable, revolving					0
Substandard Nonaccrual [Member] \| Commercial Portfolio Segment [Member]
Loans receivable	9,230		9,230		14,960
Financing Receivable, current year	0		0		0
Financing Receivable, one year before	0		0		55
Financing Receivable, two years before	38		38		14,747
Financing Receivable, three years before	9,156		9,156		0
Financing Receivable, four years before	36		36		158
Financing Receivable, prior	0		0		0
Financing Receivable, revolving	0		0		0
Substandard Nonaccrual [Member] \| Consumer Portfolio Segment [Member]
Loans receivable	$ 0		$ 0		2
Financing Receivable, current year					2
Financing Receivable, one year before					0
Financing Receivable, two years before					0
Financing Receivable, three years before					0
Financing Receivable, four years before					0
Financing Receivable, prior					0
Financing Receivable, revolving					$ 0

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