Note 8 - Stockholders' Equity - Share-based Compensation by Award (Details) - $ / shares				12 Months Ended
	Dec. 19, 2023	Dec. 16, 2022	May 14, 2021	Dec. 31, 2023	Dec. 31, 2022
Options outstanding (in shares)				101,500	85,000
Options outstanding, weighted average exercise price (in dollars per share)				$ 2.97	$ 2.52
Granted (in shares)	19,500	16,500	70,000	19,750	16,500
Granted, weighted average exercise price (in dollars per share)				$ 3.85	$ 5.29
Exercised (in shares)				(1,000)	0
Exercised, weighted average exercise price (in dollars per share)				$ 3.01	$ 0
Forfeited (in shares)				(500)	0
Forfeited, weighted average exercise price (in dollars per share)				$ 5.29	$ 0
Options outstanding (in shares)				119,750	101,500
Options outstanding, weighted average exercise price (in dollars per share)				$ 3.11	$ 2.97
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number (in shares)				107,250	76,500
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Exercise Price (in dollars per share)				$ 3.2	$ 3.15