Note 1 - Summary of Significant Accounting Policies -Schedule of Option Activity (Details) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2023 USD ($) $ / shares shares
Outstanding - January 1, 2023 (in shares) | shares	452,700
Outstanding - January 1, 2023 (in dollars per share) | $ / shares	$ 5.97
Granted (in shares) | shares	0
Granted (in dollars per share) | $ / shares	$ 0
Exercised (in shares) | shares	(10,000)
Exercised (in dollars per share) | $ / shares	$ 3.43
Cancelled (in shares) | shares	(1,600)
Cancelled (in dollars per share) | $ / shares	$ 7.18
Outstanding - March 31, 2023 (in shares) | shares	441,100
Outstanding - March 31, 2023 (in dollars per share) | $ / shares	$ 6.02
Outstanding - March 31, 2023 (Year)	6 years 8 months 4 days
Outstanding - March 31, 2023 | $	$ 2,100
Exercisable - March 31, 2023 (in shares) | shares	247,700
Exercisable - March 31, 2023 (in dollars per share) | $ / shares	$ 4.38
Exercisable - March 31, 2023 (Year)	5 years 8 months 19 days
Exercisable - March 31, 2023 | $	$ 1,556