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Note 2 - Calculation of Net Income (Loss) Per Share (Details) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Numerator:        
Net income $ 11,001 $ 3,780 $ 21,228 $ 2,406
Denominator:        
Basic weighted average shares outstanding (in shares) 18,261 14,930 18,204 14,922
Effect of dilutive securities:        
Equivalent shares issuable upon conversion of unvested restricted stock (in shares) 151 249 149 254
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) 18,413 15,179 18,361 15,176
Basic net income per share (in dollars per share) $ 0.60 $ 0.25 $ 1.17 $ 0.16
Diluted net income per share (in dollars per share) $ 0.60 $ 0.25 $ 1.16 $ 0.16