Note 8 - Incentive Plans - Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Outstanding, shares (in shares)	452,700	387,500
Outstanding, weighted average exercise price (in dollars per share)	$ 5.97	$ 4.57
Granted, shares (in shares)	94,000	94,000
Granted, weighted average exercise price (in dollars per share)	$ 9.36	$ 11.18
Exercised, shares (in shares)	(39,044)	(19,800)
Exercised, weighted average exercise price (in dollars per share)	$ 4.09	$ 3.4
Forefeited, shares (in shares)	(48,956)	(9,000)
Forefeited, weighted average exercise price (in dollars per share)	$ 7.77	$ 4.19
Outstanding, weighted average remaining contractual term (Year)	6 years 6 months 10 days	6 years 10 months 13 days
Outstanding, aggregate intrinsic value	$ 1,432	$ 2,855
Outstanding, shares (in shares)	458,700	452,700
Outstanding, weighted average exercise price (in dollars per share)	$ 6.63	$ 5.97
Exercisable, shares (in shares)	245,200
Exercisable, weighted average exercise price (in dollars per share)	$ 4.51
Exercisable, weighted average remaining contractual term (Year)	4 years 11 months 8 days
Exercisable, aggregate intrinsic value	$ 1,235