v3.26.1

Note 5 - Loans Receivable, Net and Allowance for Credit Losses (Details Textual)	3 Months Ended
	Mar. 31, 2026 USD ($)	Mar. 31, 2025 USD ($)	Dec. 31, 2025 USD ($)	Mar. 29, 2024 USD ($)
Financing Receivable, Nonaccrual, Interest Income	$ 0	$ 0
Financing Receivable, Nonaccrual, Interest Income, Foregone	324,000	139,000
Financing Receivable, Modified in Period, Amount	$ 0
Commercial Portfolio Segment [Member] \| Extended Maturity [Member]
Financing Receivable, Modified in Period, Amount		$ 2,000
Financing Receivable, to Portfolio Segment Total, Percent		0.01%
Oakmont Capital Holdings, LLC [Member]
Number of Loans Retained	23		24	60
Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net	$ 776,000		$ 854,000	$ 4,400,000

Amount of interest income foregone on financing receivable on nonaccrual status.

+ References

No definition available.

+ Details

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Namespace Prefix:	qnto_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Percentage of financing receivable to total of the portfolio segment.

+ References

No definition available.

+ Details

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Namespace Prefix:	qnto_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the number of loans retained.

+ References

No definition available.

+ Details

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Namespace Prefix:	qnto_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount classified as accounts, notes and loans receivable attributable to disposal group held for sale or disposed of.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amortized cost of financing receivable modified during period for debtor experiencing financial difficulty.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 310
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-Name Accounting Standards Codification
-Section 55
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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of interest income on financing receivable on nonaccrual status.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
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-Section 50
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-Publisher FASB
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+ Details

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Period Type:	duration

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

QUAINT OAK BANCORP, INC. 10-Q