Annual report pursuant to Section 13 and 15(d)

Quarterly Operating Results (Schedule Of Quarterly Operating Results) (Details)

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Quarterly Operating Results (Schedule Of Quarterly Operating Results) (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Quarterly Operating Results [Abstract]                      
Sales $ 22,759,000 $ 25,617,000 $ 26,311,000 $ 24,666,000 $ 27,681,000 $ 32,246,000 $ 28,198,000 $ 19,545,000 $ 99,352,934 $ 107,669,524 $ 119,071,439
Operating income (loss) (1,891,000) (1,175,000) (2,671,000) 1,280,000 (3,528,000) 431,000 (1,718,000) (5,691,000) (4,456,547) (10,505,869) 3,292,919
Net (loss) income $ (1,839,000) $ (1,264,000) $ (2,544,000) $ (2,467,000) $ (5,741,000) $ 1,284,000 $ (1,028,000) $ (4,163,000) $ (8,113,548) $ (9,648,308) $ 1,961,873
Basic net (loss) income per share $ (0.21) $ (0.14) $ (0.29) $ (0.28) $ (0.66) $ 0.15 $ (0.12) $ (0.48) $ (0.92) $ (1.11) $ 0.23
Diluted net (loss) income per share $ (0.21) $ (0.14) $ (0.29) $ (0.28) $ (0.66) $ 0.15 $ (0.12) $ (0.48) $ (0.92) $ (1.11) $ 0.23
Additional minimum pension liability adjustments                 $ (4,147,836) $ 2,197,000 $ 155,000
Foreign currency translation loss                 $ (4,238,497)