Note 10 - Stockholders' Equity - Rollforward of Outstanding Shares (Details) - shares	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2025	Dec. 31, 2024
Held in treasury, balance (in shares)		(81,584)
Repurchases of common stock (in shares)	(51,463)
Held in treasury, balance (in shares)	(133,047)	(133,047)	(81,584)
Common Stock [Member]
Shares, beginning of year (in shares)		5,454,639	5,454,639
Stock-based compensation (in shares)		16,156	0
Shares issued from settlement of Warrants (in shares)		68,996	0
Shares, end of period (in shares)	5,539,791	5,539,791	5,454,639
Treasury Stock, Common [Member]
Held in treasury, balance (in shares)		(81,584)	(81,584)
Repurchases of common stock (in shares)		(51,463)	0
Held in treasury, balance (in shares)	(133,047)	(133,047)	(81,584)
Common Stock Outstanding [Member]
Shares, beginning of year (in shares)		5,373,055	5,373,055
Stock-based compensation (in shares)		16,156	0
Shares issued from settlement of Warrants (in shares)		68,996	0
Repurchases of common stock (in shares)		(51,463)	0
Shares, end of period (in shares)	5,406,744	5,406,744	5,373,055