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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, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Net sales $ 35,627 $ 38,804 $ 28,692 $ 29,657 $ 39,179 $ 41,075 $ 39,775 $ 29,358 $ 132,780 $ 149,387 $ 173,160
Gross profit (loss) 2,076 [1] 1,915 [1] 667 [1] 1,165 [1] 3,766 2,939 (1,272) (5,750) 5,823 [1] (317) 606
Operating loss (1,233) (1,508) (2,904) (3,556) 6,334 [2] (1,253) [2] (5,257) [2] (10,192) [2] (9,201) (10,368) [2] (25,054)
Net loss $ (2,158) $ (2,069) $ (2,068) $ (3,868) $ 5,834 $ 727 $ (6,242) $ (9,583) $ (10,163) $ (9,263) $ (29,388)
Continuing operations, basic and diluted (in dollars per share) $ (0.20) $ (0.16) $ (0.15) $ (0.37)         $ (0.88) $ (0.71) $ (1.86)
Discontinued operations, basic and diluted (in dollars per share) (0.03) (0.05) (0.07) (0.03)         (0.18) (0.26) (1.21)
Net loss per share, basic and diluted (in dollars per share) $ (0.23) $ (0.21) $ (0.22) $ (0.40)         (1.06) (0.97) (3.07)
Continuing operations (in dollars per share)         $ 0.71 $ 0.15 $ (0.55) $ (1.01) (0.88) (0.71) (1.86)
Discontinued operations (in dollars per share)         (0.10) (0.07) (0.10) 0.01 $ (0.18) (0.26) $ (1.21)
Net income (loss) per share, basic (in dollars per share)         0.61 0.08 (0.65) (1)   (0.97)  
Continuing operations, diluted (in dollars per share)         0.70 0.15 (0.55) (1.01)   (0.71)  
Discontinued operations, diluted (in dollars per share)         (0.10) (0.07) (0.10) 0.01   (0.26)  
Net income (loss) per share assuming dilution (in dollars per share)         $ 0.60 $ 0.08 $ (0.65) $ (1)   $ (0.97)  
[1] 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.
[2] Operating income for the fourth quarter of 2016 includes the gain on sale of facility of $7.9 million.