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Note 2 - Income Per Share - Calculation of Net Income (Loss) Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Numerator:        
Net income $ 2,869 $ 7,627 $ 10,853 $ 28,855
Denominator:        
Basic weighted average shares outstanding (in shares) 18,194 18,119 18,177 18,175
Effect of dilutive securities:        
Equivalent shares issuable upon conversion of unvested restricted stock (in shares) 93 200 81 166
Equivalent shares issuable upon conversion of unvested employee stock options (in shares) 1 5
Denominator for diluted earnings per share – adjusted weighted-average shares and assumed conversions (in shares) 18,287 18,320 18,258 18,346
Basic net income per share (in dollars per share) $ 0.16 $ 0.42 $ 0.60 $ 1.59
Diluted net income per share (in dollars per share) $ 0.16 $ 0.42 $ 0.59 $ 1.57