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Quarterly Results of Operations (Unaudited) (Details) - USD ($)
 3 Months Ended 12 Months Ended
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, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Quarterly results of operations:                              
Total sales $ 56,122,000 $ 74,655,000 $ 81,247,000 $ 72,266,000 $ 73,162,000 $ 64,676,000 $ 68,601,000 $ 63,046,000 $ 39,065,000 $ 38,494,000 $ 47,368,000 $ 36,746,000 $ 284,290,000 $ 269,485,000 $ 161,673,000
Gross margin 3,382,000 6,484,000 8,491,000 3,149,000 6,497,000 4,862,000 7,897,000 7,885,000 5,059,000 5,752,000 7,341,000 6,479,000 21,506,000 27,141,000 24,631,000
Operating Income (Loss) (4,121,000) (4,657,000) 1,267,000 (4,017,000) (4,156,000) (1,487,000) 1,418,000 1,125,000 820,000 1,394,000 3,173,000 2,554,000 (11,528,000) (3,100,000) 7,941,000
Net income (loss) $ (5,462,000) $ (6,125,000) $ 209,000 $ (3,845,000) $ (3,942,000) $ (1,803,000) $ 445,000 $ 518,000 $ 754,000 $ 855,000 $ 2,162,000 $ 1,688,000 $ (15,223,000) $ (4,782,000) $ 5,459,000
Net income per common share:                              
Earnings Per Share, Basic $ (0.69) $ (0.78) $ 0.03 $ (0.49) $ (0.51) $ (0.23) $ 0.06 $ 0.07 $ 0.10 $ 0.11 $ 0.28 $ 0.22 $ (1.94) $ (0.62) $ 0.71
Earnings Per Share, Diluted $ (0.69) $ (0.78) $ 0.03 $ (0.49) $ (0.51) $ (0.23) $ 0.06 $ 0.07 $ 0.10 $ 0.11 $ 0.28 $ 0.22 $ (1.94) $ (0.62) $ 0.70
Product [Member]                              
Quarterly results of operations:                              
Total sales $ 54,585,000 $ 67,511,000 $ 75,440,000 $ 71,451,000 $ 68,975,000 $ 62,305,000 $ 65,225,000 $ 59,712,000 $ 37,900,000 $ 37,593,000 $ 36,794,000 $ 36,336,000 $ 268,987,000 $ 256,217,000 $ 148,623,000
Service [Member]                              
Quarterly results of operations:                              
Total tooling sales $ 1,537,000 $ 7,144,000 $ 5,807,000 $ 815,000 $ 4,187,000 $ 2,371,000 $ 3,376,000 $ 3,334,000 $ 1,165,000 $ 901,000 $ 10,574,000 $ 410,000 $ 15,303,000 $ 13,268,000 $ 13,050,000