Note 10 - Stockholders' Equity - Rollforward of Outstanding Shares (Details) - shares	9 Months Ended	12 Months Ended
	Sep. 30, 2026	Dec. 31, 2025
Held in treasury, balance (in shares)	(133,047)
Repurchases of common stock (in shares)	0
Shares, end of period (in shares)	(133,047)	(133,047)
Common Stock [Member]
Shares, beginning of year (in shares)	6,307,997	5,454,639
Stock-based compensation (in shares)	162,402	16,156
Shares withheld for employee taxes (in shares)	(1,379)	0
Shares issued from settlement of warrants (in shares)	214,462	837,202
Shares issued for settlement of subscription rights (in shares)	6,062,714	0
Shares, end of period (in shares)	12,746,196	6,307,997
Treasury Stock, Common [Member]
Held in treasury, balance (in shares)	(133,047)	(81,584)
Repurchases of common stock (in shares)	0	(51,463)
Shares, end of period (in shares)	(133,047)	(133,047)
Common Stock Outstanding [Member]
Shares, beginning of year (in shares)	6,174,950	5,373,055
Stock-based compensation (in shares)	162,402	16,156
Shares withheld for employee taxes (in shares)	(1,379)	0
Shares issued from settlement of warrants (in shares)	214,462	837,202
Shares issued for settlement of subscription rights (in shares)	6,062,714	0
Repurchases of common stock (in shares)	0	(51,463)
Shares, end of period (in shares)	12,613,149	6,174,950