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Note 21 - Quarterly Data (Unaudited) - Summary of Quarterly Financial Data (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
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
Revenue from Contract with Customer, Including Assessed Tax $ 72,245 $ 75,226 $ 69,203 $ 62,643 $ 57,544 $ 52,455 $ 28,785 $ 33,365 $ 279,317 $ 172,149 $ 132,780
Gross profit (loss) 16,920 [1] 15,475 [1] 8,218 [1] 6,571 [1] 6,783 5,203 (1,238) 1,348 47,184 [1] 12,096 5,815
Operating income (loss) 12,277 10,575 3,513 2,324 2,701 [2] 2,497 [2] (5,827) [2] (2,342) [2] 28,689 (2,971) [2] (9,209)
Net income (loss) $ 12,016 [3] $ 10,747 [3] $ 2,974 [3] $ 2,165 [3] $ 148 [4] $ 27,801 [4] $ (5,686) [4] $ (1,951) [4] $ 27,902 [3] $ 20,312 [4] $ (10,163)
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)
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] Gross profit includes $3.2 million, $0.7 million, and $2.7 million in incremental production costs resulting from the fire at the Company's Saginaw, Texas facility in the second, third, and fourth quarters of 2019, respectively. These costs were offset by $1.0 million and $4.0 million of business interruption insurance proceeds in the third and fourth quarters of 2019, respectively.
[2] Operating income for the third quarter of 2018 includes a gain on sale of facility of $2.8 million for the sale of property in Houston, Texas. Operating income for the fourth quarter of 2018 includes a gain on sale of facility of $0.2 million for the sale of the Monterrey, Mexico facility.
[3] 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.
[4] 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.