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Note 11 - Equity Plans - Restricted Stock Unit Activity (Details) - Restricted Stock Units (RSUs) [Member] - $ / shares
6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Outstanding, number of shares (in shares) 636,086 527,546 527,546
Outstanding, weighted average estimated fair value (in dollars per share) $ 19.25 $ 20.65 $ 20.65
Granted, number of shares (in shares) 70,588 156,562  
Granted, weighted average estimated fair value (in dollars per share) $ 11.92 $ 17.40  
Converted into shares, number of shares (in shares) (94,161) 0  
Converted into shares, weighted average estimated fair value (in dollars per share) $ 20.27 $ 0  
Forfeited, number of shares (in shares) (494) (1,854)  
Forfeited, weighted average estimated fair value (in dollars per share) $ 27.31 $ 24.25  
Outstanding, number of shares (in shares) 612,019 682,254 636,086
Outstanding, weighted average estimated fair value (in dollars per share) $ 18.25 $ 19.89 $ 19.25
Vested, number of shares (in shares) 375,692 515,386  
Vested, weighted average estimated fair value (in dollars per share) $ 18.94 $ 20.40