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Note 8 - Stock-based Compensation - Summary of Restricted Common Stock Activity (Details) - $ / shares
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Restricted Stock [Member]    
Outstanding, Shares (in shares) 917,533 977,547
Outstanding, Weighted average grant date fair value (in dollars per share) $ 16.84 $ 15.45
Granted, Shares (in shares) 296,042 248,543
Granted, Weighted average grant date fair value (in dollars per share) $ 18.21 $ 21.69
Forfeited, Shares (in shares) 0 (85,630)
Forfeited, Weighted average grant date fair value (in dollars per share) $ 0 $ 15.53
Vested, Shares (in shares) (502,241) (260,004)
Vested, Weighted average grant date fair value (in dollars per share) $ 16.10 $ 14.20
Outstanding, Shares (in shares) 711,334 880,456
Outstanding, Weighted average grant date fair value (in dollars per share) $ 17.94 $ 17.57
Restricted Stock [Member] | Common Class A [Member]    
Outstanding, Shares (in shares) 480,042 449,284
Outstanding, Weighted average grant date fair value (in dollars per share) $ 16.10 $ 13.55
Granted, Shares (in shares) [1] 233,425 166,814
Granted, Weighted average grant date fair value (in dollars per share) $ 17.67 $ 19.87
Vested, Shares (in shares) (248,539) (136,056)
Vested, Weighted average grant date fair value (in dollars per share) $ 15.00 $ 12.32
Outstanding, Shares (in shares) 464,928 480,042
Outstanding, Weighted average grant date fair value (in dollars per share) $ 17.47 $ 16.10
Restricted Stock Units (RSUs) [Member]    
Outstanding, Shares (in shares) 90,184 398,000
Outstanding, Weighted average grant date fair value (in dollars per share) $ 18.92 $ 18.21
Granted, Shares (in shares) 95,115 90,184
Granted, Weighted average grant date fair value (in dollars per share) $ 19.05 $ 18.92
Vested, Shares (in shares) (60,052) 0
Vested, Weighted average grant date fair value (in dollars per share) $ 18.92 $ 0
Outstanding, Shares (in shares) 125,247 488,184
Outstanding, Weighted average grant date fair value (in dollars per share) $ 19.02 $ 18.34
[1] For awards subject to future performance conditions, amounts assume target performance.