Note 1 - Summary of Significant Accounting Policies -Schedule of Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Outstanding, shares (in shares)		452,700
Outstanding, weighted average exercise price per share (in dollars per share)		$ 5.97
Granted, shares (in shares)	13,000	29,000	108,000
Granted, weighted average exercise price per share (in dollars per share)		$ 9.37
Exercised, shares (in shares)		(36,044)
Exercised, weighted average exercise price per share (in dollars per share)		$ 4.12
Cancelled, shares (in shares)		(43,956)
Cancelled, weighted average exercise price per share (in dollars per share)		$ 7.50
Outstanding, shares (in shares)		401,700
Outstanding, weighted average exercise price per share (in dollars per share)		$ 6.21
Outstanding, weighted average remaining contractual term (Year)		6 years 6 months 7 days
Outstanding, aggregate intrinsic value		$ 1,510
Exercisable , shares (in shares)		244,400
Exercisable, weighted average exercise price per share (in dollars per share)		$ 4.43
Exercisable, weighted average remaining contractual term (Year)		5 years 4 months 28 days
Exercisable, aggregate intrinsic value		$ 1,311