Note 9 - Earnings Per Share - Reconciliation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Net income	$ 5,230	$ 10,478
Weighted average shares outstanding - basic (in shares)	15,679,027	15,221,336
Dilutive common stock equivalents (in shares)	486,241	770,138
Weighted average number of shares outstanding during the period, diluted (in shares)	16,165,268	15,991,474
Basic (in dollars per share)	$ 0.33	$ 0.69
Diluted (in dollars per share)	$ 0.32	$ 0.66