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Note 13 - Net Income Per Share - Net Loss Per Basic and Diluted Weighted Average Common Shares Outstanding (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Net income $ 10,747 $ 27,801 $ 15,886 $ 20,164
Basic weighted-average common shares outstanding (in shares) 9,745 9,735 9,739 9,723
Effect of potentially dilutive common shares(1) (in shares) [1] 40 23 9
Diluted weighted-average common shares outstanding (in shares) 9,785 9,735 9,762 9,732
Basic (in dollars per share) $ 1.10 $ 2.86 $ 1.63 $ 2.07
Diluted (in dollars per share) $ 1.10 $ 2.86 $ 1.63 $ 2.07
[1] The weighted-average number of antidilutive shares not included in the computation of diluted net income per share was approximately 64,000 and 62,000 for the three and nine months ended September 30, 2018, respectively, including approximately 40,000 and 38,000, respectively, of performance-based share awards, at the target level of 100%, that were not included because the performance conditions had not been met as of September 30, 2018.