Note 16 - Net Income Per Share - Basic and Diluted Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Net income	$ 23,162	$ 4,184	$ 22,710	$ 14,533	$ 13,368	$ 13,232	$ 50,056	$ 41,133
Weighted average shares outstanding - basic (in shares)	26,485			22,582			24,360	22,553
Dilutive securities (in shares)	241			220			242	206
Weighted average shares outstanding- diluted (in shares)	26,726			22,802			24,602	22,759
Net income per share, basic (in dollars per share)	$ 0.87			$ 0.64			$ 2.05	$ 1.82
Net income per share, diluted (in dollars per share)	$ 0.87			$ 0.64			$ 2.03	$ 1.81