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Note 13 - Net Income (Loss) 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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Income (loss) from continuing operations $ 27,801 $ (1,587) $ 20,164 $ (6,550)
Loss on discontinued operations (482) (1,455)
Net income (loss) $ 27,801 $ (2,069) $ 20,164 $ (8,005)
Basic weighted-average common shares outstanding (in shares) 9,735 9,620 9,723 9,611
Effect of potentially dilutive common shares(1) (in shares) [1] 9
Diluted weighted-average common shares outstanding (in shares) 9,735 9,620 9,732 9,611
Continuing operations (in dollars per share) $ 2.86 $ (0.16) $ 2.07 $ (0.68)
Discontinued operations (in dollars per share) (0.05) (0.15)
Net income (loss) per share (in dollars per share) 2.86 (0.21) 2.07 (0.83)
Continuing operations (in dollars per share) 2.86 (0.16) 2.07 (0.68)
Discontinued operations (in dollars per share) (0.05) (0.15)
Net income (loss) per share assuming dilution (in dollars per share) $ 2.86 $ (0.21) $ 2.07 $ (0.83)
[1] The weighted-average number of such antidilutive shares not included in the computation of diluted net income per share for the three and nine months ended September 30, 2018 was approximately 64,000 and 62,000, 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. The weighted-average number of such antidilutive shares not included in the computation of diluted net loss per share for the three and nine months ended September 30, 2017 was approximately 194,000 and 195,000, respectively.