Note 9 - Stockholders' Equity - Summary of Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Outstanding, Number of shares (in shares)	106,000
Outstanding, Weighted average exercise price (in dollars per share)	$ 20.24
Outstanding, Weighted average remaining contractual term (Year)	2 years 6 months	2 years
Outstanding, Aggregated intrinsic value	$ 316	$ 609
Granted, Number of shares (in shares)	19,425
Granted, weighted average exercise price (in dollars per share)	$ 21.62
Exercised, Number of shares (in shares)	(26,000)
Exercised, Weighted average exercise price (in dollars per share)	$ 19.36
Forfeited or expired, Number of shares (in shares)	0
Outstanding, Number of shares (in shares)	99,425	106,000
Outstanding, Weighted average exercise price (in dollars per share)	$ 20.74	$ 20.24
Exercisable, Number of shares (in shares)	80,000
Exercisable, Weighted average exercise price (in dollars per share)	$ 20.53
Exercisable, Weighted average remaining contractual term (Year)	1 year 6 months
Exercisable, Aggregated intrinsic value	$ 295