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14. Quarterly Financial Data (Details) (USD $) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Quarterly Financial Data Details Usd                    
Revenues $ 35,346 $ 38,510 $ 38,067 $ 34,726 $ 41,475 $ 48,348 $ 57,195 $ 60,665 $ 146,649 $ 207,683
Cost of goods sold 33,902 37,476 36,118 34,954 39,023 40,633 45,842 45,041 142,450 170,539
Gross profit (loss) 1,444 1,034 1,949 (228) 2,452 7,715 11,353 15,624 4,199 37,144
Research and development expenses 117 117 104 109 117 101 141 100 447 459
Selling, general and administrative expenses 2,805 2,774 3,148 3,634 3,332 2,972 3,449 2,842 12,361 12,595
Operating income/(loss) (1,478) (1,857) (1,303) (3,971) (997) 4,642 7,763 12,682 (8,609) 24,090
Other expense                    
Interest rate expense (2,523) (2,610) (2,485) (2,546) (2,315) (2,287) (2,530) (2,920) (10,164) (10,052)
Amortization expense (1,329) (1,258) (2,405) (1,723) (677) (741) (2,502) (2,118) (6,715) (6,038)
Loss on debt extinguishment 0 0 0 (330) 0 (1,231) 0 (115) (330) (1,346)
Gain on sale of assets         0 0 (119) 0 0 (119)
Loss on impairment of goodwill and intangible assets (1,044) 0 0 0         (1,044) 0
Other income/(expense) (79) (30) (94) (67) 249 81 110 164 (270) 604
Income /(Loss) before income taxes (6,453) (5,755) (6,287) (8,637) (3,740) 464 2,722 7,693 (27,132) 7,139
Income tax expense 0 0 0 (6) 0 0 0 (6) (6) (6)
Net income /(loss) (6,453) (5,755) (6,287) (8,643) (3,740) 464 2,722 7,687 (27,138) 7,133
Other comprehensive income (loss)                    
Foreign currency translation adjustment (67) (104) (84) 38 (56) (98) 0 108 (217) (46)
Comprehensive income (loss) $ (6,520) $ (5,859) $ (6,371) $ (8,605) $ (3,796) $ 366 $ 2,722 $ 7,795 $ (27,355) $ 7,087
Net (loss)/income per common share                    
Basic $ (0.33) $ (0.29) $ (0.32) $ (0.42) $ (0.18) $ 0.02 $ 0.13 $ 0.38 $ (1.37) $ 0.35
Diluted $ (0.33) $ (0.29) $ (0.32) $ (0.42) $ (0.18) $ 0.02 $ 0.13 $ 0.34 $ (1.37) $ 0.34
Weighted average shares outstanding                    
Basic 19,598 19,521 19,590 20,595 20,630 20,555 20,284 20,007 19,823 20,371
Diluted 19,598 19,521 19,590 20,595 20,630 21,476 20,948 22,657 19,823 21,047