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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
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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.

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