Annual report pursuant to Section 13 and 15(d)

Quarterly Operating Results (Details)

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Quarterly Operating Results (Details) - USD ($)
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
Dec. 31, 2013
Quarterly Operating Results [Abstract]                      
Sales $ 27,681,000 $ 32,246,000 $ 28,198,000 $ 19,545,000 $ 27,230,000 $ 33,434,000 $ 33,209,000 $ 25,198,000 $ 107,669,524 $ 119,071,439 $ 131,319,510
Gross margins 7,696,000 10,424,000 8,539,000 4,887,000 9,064,000 12,013,000 12,094,000 8,988,000 31,546,000 42,159,000 44,899,000
Operating (loss) income (3,528,000) 431,000 (1,718,000) (5,691,000) (1,519,000) 2,658,000 2,406,000 (252,000) (10,505,869) 3,292,919 1,156,367
Net (loss) income $ (5,741,000) $ 1,284,000 $ (1,028,000) $ (4,163,000) $ (1,029,000) $ 1,695,000 $ 1,437,000 $ (141,000) $ (9,648,308) $ 1,961,873 $ (957,888)
Basic net (loss) income per share: $ (0.66) $ 0.15 $ (0.12) $ (0.48) $ (0.12) $ 0.20 $ 0.17 $ (0.02) $ (1.11) $ 0.23 $ (0.11)
Diluted net (loss) income per share: $ (0.66) $ 0.15 $ (0.12) $ (0.48) $ (0.12) $ 0.20 $ 0.17 $ (0.02) $ (1.11) $ 0.23 $ (0.11)
Pension settlement costs                 $ 1,222,276    
Valuation allowance $ 3,700,000               $ 5,668,000