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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 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Net income (loss) $ 2,974 $ (5,686) $ 5,139 $ (7,637)
Basic weighted-average common shares outstanding (in shares) 9,736 9,727 9,736 9,717
Effect of potentially dilutive common shares(1) (in shares) [1] 17 9
Diluted weighted-average common shares outstanding (in shares) 9,753 9,727 9,745 9,717
Basic (in dollars per share) $ 0.31 $ (0.59) $ 0.53 $ (0.79)
Diluted (in dollars per share) $ 0.31 $ (0.59) $ 0.53 $ (0.79)
[1] The weighted-average number of antidilutive shares not included in the computation of diluted net loss per share was approximately 64,000 and 75,000 for the three and six months ended June 30, 2018, respectively, including approximately 40,000 and 37,000, 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 June 30, 2018.