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Note 2 - Summary of Significant Accounting Policies - Loss Per Basic and Diluted Weighted Average Common Share Outstanding for Continuing and Discontinued Operations (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income (loss) from continuing operations |  |  |  |  |  |  |  |  |  | $ (1,842) | $ (1,587) | $ (1,421) | $ (3,542) | $ 20,312 |  |  | $ (8,392) | $ (6,741)
Loss on discontinued operations |  |  |  |  |  |  |  |  |  | (316) | (482) | (647) | (326) |  |  |  | (1,771) | (2,522)
Net income (loss) |  | $ 148 | [1] | $ 27,801 | [1] | $ (5,686) | [1] | $ (1,951) | [1] | $ (2,158) | $ (2,069) | $ (2,068) | $ (3,868) | $ 20,312 | [1] | $ 20,312 | $ (10,163) | $ (9,263)
Basic (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,726 |  |  | 9,613 | 9,588
Effect of potentially dilutive common shares(1) (in shares) | [2] |  |  |  |  |  |  |  |  |  |  |  |  | 7 |  |  |  |
Diluted weighted-average common shares outstanding (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,733 |  |  | 9,613 | 9,588
Continuing operations, basic (in dollars per share) |  |  |  |  |  |  |  |  |  | $ (0.20) | $ (0.16) | $ (0.15) | $ (0.37) | $ 2.09 |  |  | $ (0.88) | $ (0.71)
Discontinued operations, basic (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (0.18) | (0.26)
Net income (loss) per share, basic (in dollars per share) |  | $ 0.02 |  | $ 2.86 |  | $ (0.59) |  | $ (0.20) |  |  |  |  |  | 2.09 |  |  | (1.06) | (0.97)
Continuing operations, diluted (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.09 |  |  | (0.88) | (0.71)
Net income (loss) per share, diluted (in dollars per share) |  | $ 0.02 |  | $ 2.86 |  | $ (0.59) |  | $ (0.20) |  |  |  |  |  | $ 2.09 |  |  | $ (1.06) | $ (0.97)
[1] | Net income for the third quarter of 2018 includes a preliminary bargain purchase gain of $21.9 million. Net income for the fourth quarter of 2018 includes a measurement period adjustment of $1.8 million to decrease the bargain purchase gain.
[2] | The weighted-average number of antidilutive shares not included in the computation of diluted net income per share was approximately 63,000, for the year ended December 31, 2018, including approximately 39,000 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 December 31, 2018. The weighted-average number of antidilutive shares not included in the computation of diluted net loss per share was approximately 196,000 and 198,000 for the years ended December 31, 2017 and 2016, respectively.

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