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Note 2 - Calculation of Net Income (Loss) Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Numerator:        
Net income $ 3,632 $ 11,001 $ 7,984 $ 21,228
Denominator:        
Denominator for basic earnings per share – weighted-average shares (in shares) 18,189 18,261 18,168 18,204
Effect of dilutive securities:        
Equivalent shares issuable upon conversion of unvested restricted stock (in shares) 86 151 76 149
Equivalent shares issuable upon conversion of unvested employee stock options (in shares) 1 8
Denominator for diluted earnings per share – adjusted weighted-average shares and assumed conversions (in shares) 18,275 18,413 18,244 18,361
Basic net income per share (in dollars per share) $ 0.20 $ 0.60 $ 0.44 $ 1.17
Diluted net income per share (in dollars per share) $ 0.20 $ 0.60 $ 0.44 $ 1.16