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Quarterly Results of Operations (Unaudited) (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Quarterly results of operations:                              
Net sales $ 60,654,000 $ 59,873,000 $ 37,806,000 $ 64,023,000 $ 56,122,000 $ 74,655,000 $ 81,247,000 $ 72,266,000 $ 73,162,000 $ 64,676,000 $ 68,601,000 $ 63,046,000 $ 222,356,000 $ 284,290,000 $ 269,485,000
Gross margin 9,967,000 10,838,000 2,903,000 10,766,000 3,382,000 6,484,000 8,491,000 3,149,000 6,497,000 4,862,000 7,897,000 7,885,000 34,474,000 21,506,000 27,141,000
Operating Income (Loss) 3,014,000 4,321,000 (1,206,000) 4,261,000 (4,121,000) (4,657,000) 1,267,000 (4,017,000) (4,156,000) (1,487,000) 1,418,000 1,125,000 10,390,000 (11,528,000) (3,100,000)
Net income (loss) $ (867,000) $ 3,343,000 $ (2,272,000) $ 7,961,000 $ (5,462,000) $ (6,125,000) $ 209,000 $ (3,845,000) $ (3,942,000) $ (1,803,000) $ 445,000 $ 518,000 $ 8,165,000 $ (15,223,000) $ (4,782,000)
Net income (loss) per common share:                              
Basic $ (0.10) $ 0.39 $ (0.29) $ 0.97 $ (0.69) $ (0.78) $ 0.03 $ (0.49) $ (0.51) $ (0.23) $ 0.06 $ 0.07 $ 0.98 $ (1.94) $ (0.62)
Diluted $ (0.10) $ 0.39 $ (0.29) $ 0.97 $ (0.69) $ (0.78) $ 0.03 $ (0.49) $ (0.51) $ (0.23) $ 0.06 $ 0.07 $ 0.98 $ (1.94) $ (0.62)
Product                              
Quarterly results of operations:                              
Net sales $ 58,563,000 $ 54,240,000 $ 35,847,000 $ 61,930,000 $ 54,585,000 $ 67,511,000 $ 75,440,000 $ 71,451,000 $ 68,975,000 $ 62,305,000 $ 65,225,000 $ 59,712,000 $ 210,580,000 $ 268,987,000 $ 256,217,000
Tooling                              
Quarterly results of operations:                              
Net sales $ 2,091,000 $ 5,633,000 $ 1,959,000 $ 2,093,000 $ 1,537,000 $ 7,144,000 $ 5,807,000 $ 815,000 $ 4,187,000 $ 2,371,000 $ 3,376,000 $ 3,334,000 $ 11,776,000 $ 15,303,000 $ 13,268,000