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Note 10 - Net Income Per Share - Basic and Diluted Net Income Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Net income $ 25,410 $ 228
Basic weighted average shares (in shares) 38,992 39,209
Stock options (in shares) 770 870
Restricted stock units (in shares) 236 351
Employee stock purchase plan (in shares) 3 0
Diluted weighted average shares (in shares) 40,001 40,430
Basic (in dollars per share) $ 0.65 $ 0.01
Diluted (in dollars per share) $ 0.64 $ 0.01