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Note 7 - Stock-based Compensation - Summary of Restricted Common Stock Activity (Details) - $ / shares
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Restricted Stock [Member]    
Outstanding, Shares (in shares) 503,685 396,033
Outstanding, Weighted average grant date fair value (in dollars per share) $ 11.14 $ 12.06
Granted, Shares (in shares) 318,196 307,943
Granted, Weighted average grant date fair value (in dollars per share) $ 15.25 $ 10.40
Vested, Shares (in shares) (225,570) (200,291)
Vested, Weighted average grant date fair value (in dollars per share) $ 11.21 $ 11.82
Outstanding, Shares (in shares) 596,311 503,685
Outstanding, Weighted average grant date fair value (in dollars per share) $ 13.31 $ 11.14
Restricted Stock [Member] | Common Class A [Member]    
Outstanding, Shares (in shares) 462,632 415,082
Outstanding, Weighted average grant date fair value (in dollars per share) $ 10.63 $ 10.15
Granted, Shares (in shares) [1] 220,080 198,220
Granted, Weighted average grant date fair value (in dollars per share) [1] $ 12.65 $ 10.60
Vested, Shares (in shares) (274,926) (227,526)
Vested, Weighted average grant date fair value (in dollars per share) $ 10.48 $ 10
Outstanding, Shares (in shares) 407,786 385,776
Outstanding, Weighted average grant date fair value (in dollars per share) $ 11.82 $ 10.47
Restricted Stock Units (RSUs) [Member]    
Outstanding, Shares (in shares) 209,500 0
Outstanding, Weighted average grant date fair value (in dollars per share) $ 15.70 $ 0
Granted, Shares (in shares) 0
Granted, Weighted average grant date fair value (in dollars per share) $ 0
Vested, Shares (in shares) (209,500) 0
Vested, Weighted average grant date fair value (in dollars per share) $ 15.70 $ 0
Outstanding, Shares (in shares) 0
Outstanding, Weighted average grant date fair value (in dollars per share) $ 0
Forfeited, Shares (in shares) 0
Forfeited, Weighted average grant date fair value (in dollars per share) $ 0
[1] For awards subject to future performance conditions, amounts assume target performance.