Note 6 - Stockholders' Equity - Share-based Compensation by Award (Details) - $ / shares		3 Months Ended
	Dec. 19, 2025	Mar. 31, 2026	Mar. 31, 2025
Balance, Shares (in shares)		128,250	115,750
Balance, weighted average exercise price (in dollars per share)		$ 3.36	$ 3.28
Granted, Shares (in shares)	19,500	0	0
Granted, weighted average exercise price (in dollars per share)		$ 0	$ 0
Exercised, Shares (in shares)		0	0
Exercised, weighted average exercise price (in dollars per share)		$ 0	$ 0
Expired, Shares (in shares)		(3,750)	(2,000)
Expired, weighted average exercise price (in dollars per share)		$ 3.91	$ 3.96
Balance, Shares (in shares)		124,500	113,750
Balance, weighted average exercise price (in dollars per share)		$ 3.34	$ 3.27
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number (in shares)		124,500	113,750
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Exercise Price (in dollars per share)		$ 3.34	$ 3.27