Note 10 - Stockholders' Equity - Rollforward of Outstanding Shares (Details) - shares	3 Months Ended	12 Months Ended
	Mar. 31, 2025	Dec. 31, 2024
Shares, beginning of year (in shares)	5,454,639	5,454,639
Held in treasury, balance (in shares)	(81,584)	(81,584)
Shares, beginning of year (in shares)	(5,373,055)	(5,373,055)
Shares, beginning of year (in shares)	5,373,055	5,373,055
Stock-based compensation (in shares)		0
Shares, end of period (in shares)		5,454,639
Held in treasury, balance (in shares)	(81,584)	(81,584)
Shares, end of period (in shares)		(5,373,055)
Shares, end of period (in shares)		5,373,055
Common Stock [Member]
Shares, beginning of year (in shares)	5,454,639
Stock-based compensation (in shares)	16,156
Shares, end of period (in shares)	5,470,795	5,454,639
Treasury Stock, Common [Member]
Held in treasury, balance (in shares)	(81,584)
Held in treasury, balance (in shares)	(81,584)	(81,584)
Common Stock Outstanding [Member]
Shares, beginning of year (in shares)	5,373,055
Shares, beginning of year (in shares)	(5,373,055)
Stock-based compensation (in shares)	16,156
Shares, end of period (in shares)	5,389,211	5,373,055
Shares, end of period (in shares)	(5,389,211)	(5,373,055)