Note 9 - Net Income Per Share - Reconciliation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Net income	$ 888	$ 5,230
Weighted average shares outstanding - basic (in shares)	15,882,994	15,679,027
Dilutive common stock equivalents (in shares)	235,335	486,241
Weighted average shares outstanding - diluted (in shares)	16,118,329	16,165,268
Basic (in dollars per share)	$ 0.06	$ 0.33
Diluted (in dollars per share)	$ 0.06	$ 0.32