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Note 2 - Calculation of Net Income (Loss) Per Share (Details) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Numerator:        
Net income $ 7,627 $ 1,857 $ 28,855 $ 4,263
Denominator:        
Basic weighted average shares outstanding (in shares) 18,119 14,959 18,175 14,935
Effect of dilutive securities:        
Equivalent shares issuable upon conversion of unvested restricted stock (in shares) 200 185 166 231
Equivalent shares issuable upon conversion of unvested employee stock options (in shares) 1 1 5
Denominator for diluted earnings per share – adjusted weighted-average shares and assumed conversions (in shares) 18,320 15,145 18,346 15,166
Basic net income per share (in dollars per share) $ 0.42 $ 0.12 $ 1.59 $ 0.29
Diluted net income per share (in dollars per share) $ 0.42 $ 0.12 $ 1.57 $ 0.28