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Quarterly Results of Operations (Unaudited) (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
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, 2017
Dec. 31, 2016
Dec. 31, 2015
Quarterly results of operations:                              
Total product sales $ 37,900,000 $ 37,593,000 $ 36,794,000 $ 36,336,000 $ 33,465,000 $ 33,816,000 $ 36,813,000 $ 42,530,000 $ 43,492,000 $ 44,243,000 $ 53,514,000 $ 47,854,000 $ 148,623,000 $ 146,624,000 $ 189,103,000
Total tooling sales 1,165,000 901,000 10,574,000 410,000 15,607,000 7,520,000 2,193,000 2,938,000 3,072,000 3,806,000 1,342,000 1,745,000 13,050,000 28,258,000 9,965,000
Total net sales 39,065,000 38,494,000 47,368,000 36,746,000 49,072,000 41,336,000 39,006,000 45,468,000 46,564,000 48,049,000 54,856,000 49,599,000 161,673,000 174,882,000 199,068,000
Gross margin 5,072,000 5,764,000 7,353,000 6,491,000 7,157,000 5,581,000 6,323,000 8,863,000 7,934,000 8,311,000 10,982,000 9,025,000 24,680,000 27,924,000 36,252,000
Income before interest and taxes 833,000 1,406,000 3,185,000 2,566,000 3,139,000 1,657,000 2,307,000 4,442,000 3,474,000 3,902,000 6,232,000 4,890,000 7,990,000 11,545,000 18,498,000
Net income $ 754,000 $ 855,000 $ 2,162,000 $ 1,688,000 $ 2,032,000 $ 1,029,000 $ 1,460,000 $ 2,890,000 $ 2,331,000 $ 2,484,000 $ 4,039,000 $ 3,196,000 $ 5,459,000 $ 7,411,000 $ 12,050,000
Net income per common share:                              
Basic (USD per share) $ 0.10 $ 0.11 $ 0.28 $ 0.22 $ 0.27 $ 0.13 $ 0.19 $ 0.38 $ 0.31 $ 0.33 $ 0.53 $ 0.42 $ 0.71 $ 0.97 $ 1.59
Diluted (USD per share) $ 0.10 $ 0.11 $ 0.28 $ 0.22 $ 0.26 $ 0.13 $ 0.19 $ 0.38 $ 0.31 $ 0.33 $ 0.53 $ 0.42 $ 0.70 $ 0.97 $ 1.58