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Note 20 - Quarterly Data (Unaudited) - Summary of Quarterly Financial Data (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
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
Net sales $ 57,544 $ 52,455 $ 28,785 $ 33,365 $ 35,627 $ 38,804 $ 28,692 $ 29,657 $ 172,149   $ 132,780 $ 149,387
Gross profit (loss) 6,783 [1] 5,203 [1] (1,238) [1] 1,348 [1] 1,833 [2] 1,993 [2] 746 [2] 1,243 [2] 12,096 [1]   5,815 [2] 64
Operating income (loss) (1) 2,701 [1] 2,497 [1] (5,827) [1] (2,342) [1] (1,475) (1,430) (2,826) (3,478) (2,971) [1]   (9,209) (9,987)
Net income (loss) (2) $ 148 [3] $ 27,801 [3] $ (5,686) [3] $ (1,951) [3] (2,158) (2,069) (2,068) (3,868) $ 20,312 [3] $ 20,312 $ (10,163) $ (9,263)
Basic (in dollars per share) $ 0.02 $ 2.86 $ (0.59) $ (0.20)         $ 2.09   $ (1.06) $ (0.97)
Diluted (in dollars per share) $ 0.02 $ 2.86 $ (0.59) $ (0.20)         $ 2.09   $ (1.06) $ (0.97)
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)
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)         (0.03) (0.05) (0.07) (0.03)   (0.18) $ (0.26)
Net loss per share (in dollars per share)         $ (0.23) $ (0.21) $ (0.22) $ (0.40)     $ (1.06)  
[1] 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.
[2] Gross profit for the fourth quarter of 2017 includes a charge of $1.2 million to cost of sales as a result of a change in estimate to workers compensation reserves.
[3] 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.