Note 10 - Stockholders' Equity - Roll Forward of Outstanding Shares (Details) - shares	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Shares, balance (in shares)	5,454,639	5,434,521
Held in treasury, balance (in shares)	(81,584)	(81,584)
Shares outstanding, balance (in shares)	5,373,055	5,352,937
Stock-based compensation (in shares)	0	20,118
Shares, balance (in shares)	5,454,639	5,454,639
Held in treasury, balance (in shares)	(81,584)	(81,584)
Shares outstanding, balance (in shares)	5,373,055	5,373,055