Note 8 - Stockholders' Equity - Stock Option and Warrant Activity (Details) - $ / shares			3 Months Ended		6 Months Ended
	Jan. 30, 2026	Mar. 05, 2025	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2026
Outstanding, options (in shares)					1,988,677
Outstanding, options, weighted average exercise price (in dollars per share)					$ 1.99
Outstanding, warrants (in shares)
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)	250,000				250,000
Granted, options, weighted average exercise price (in dollars per share)	$ 0.82				$ 0.82
Exercised or redeemed, options (in shares)					(1,000)
Exercised or redeemed, options, weighted average exercise price (in dollars per share)					$ 0.81
Exercised or redeemed, warrants (in shares)				(13,000)
Forfeited, options (in shares)		(108)			(27,004)
Forfeited, options, weighted average exercise price (in dollars per share)					$ 1.79
Expired, options (in shares)					(48)
Expired, options, weighted average exercise price (in dollars per share)					$ 227.5
Expired, warrants (in shares)			(31,564)	0	(32,891)
Outstanding, options (in shares)			2,210,625		2,210,625
Outstanding, options, weighted average exercise price (in dollars per share)			$ 1.86		$ 1.86
Outstanding, warrants (in shares)			828,642		828,642
Options vested and exercisable (in shares)			1,674,784		1,674,784
Options vested and exercisable, options, weighted average exercise price (in dollars per share)			$ 2.14		$ 2.14
Stock Warrants [Member]
Outstanding, warrants (in shares)					861,533
Outstanding, warrants, weighted average exercise price (in dollars per share)					$ 2.77
Granted, warrants (in shares)					0
Granted, warrants, weighted average exercise price (in dollars per share)					$ 0
Exercised or redeemed, warrants (in shares)					0
Exercised or redeemed, warrants, weighted average exercise price (in dollars per share)					$ 0
Expired, warrants (in shares)					(32,891)
Expired, warrants, weighted average exercise price (in dollars per share)					$ 9.06
Outstanding, warrants (in shares)			828,642		828,642
Outstanding, warrants, weighted average exercise price (in dollars per share)			$ 2.37		$ 2.37

Bridgeline Digital, Inc. 10-Q