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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, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income (loss) from continuing operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 27,902 |  | $ 20,312 |  | $ (8,392)
Loss on discontinued operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,771)
Net income (loss) |  | $ 12,016 | [1] | $ 10,747 | [1] | $ 2,974 | [1] | $ 2,165 | [1] | $ 148 | [2] | $ 27,801 | [2] | $ (5,686) | [2] | $ (1,951) | [2] | $ 27,902 | [1] | $ 20,312 | [2] | $ (10,163)
Basic (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,741 |  | 9,726 |  | 9,613
Effect of potentially dilutive common shares(1) (in shares) | [3] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 38 |  | 7 |  |
Diluted weighted-average common shares outstanding (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,779 |  | 9,733 |  | 9,613
Continuing operations, basic (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2.86 |  | $ 2.09 |  | $ (0.88)
Discontinued operations, basic (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (0.18)
Net income (loss) per share, basic (in dollars per share) |  | $ 1.23 |  | $ 1.10 |  | $ 0.31 |  | $ 0.22 |  | $ 0.02 |  | $ 2.86 |  | $ (0.59) |  | $ (0.20) |  | 2.86 |  | 2.09 |  | (1.06)
Continuing operations, diluted (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.85 |  | 2.09 |  | (0.88)
Net income (loss) per share, diluted (in dollars per share) |  | $ 1.22 |  | $ 1.10 |  | $ 0.31 |  | $ 0.22 |  | $ 0.02 |  | $ 2.86 |  | $ (0.59) |  | $ (0.20) |  | $ 2.85 |  | $ 2.09 |  | $ (1.06)
[1] | Net income for the third quarter of 2019 includes $2.3 million of proceeds related to a legal settlement involving certain pipe produced at the Company's former Houston, Texas and Bossier City, Louisiana facilities and gain on insurance proceeds of $0.4 million resulting from the fire at the Company's Saginaw, Texas facility. Net income for the fourth quarter of 2019 includes gain on insurance proceeds of $1.2 million resulting from the fire at the Company's Saginaw, Texas facility.
[2] | 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.
[3] | There were no antidilutive shares for the year ended December 31, 2019. 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 for the year ended December 31, 2017.

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