Note 10 - Stockholders' Equity - Rollforward of Outstanding Shares (Details) - shares	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Held in treasury, balance (in shares)	(81,584)
Repurchases of common stock (in shares)	0	0
Held in treasury, balance (in shares)	(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
Stock issued for settlement of warrants (in shares)	837,202	0
Shares, end of year (in shares)	6,307,997	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)	(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
Stock issued for settlement of warrants (in shares)	837,202	0
Repurchases of common stock (in shares)	(51,463)	0
Shares, end of year (in shares)	6,174,950	5,373,055