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Quarterly Results of Operations (Unaudited) (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, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Quarterly results of operations:                              
Total product sales $ 33,465,000 $ 33,816,000 $ 36,813,000 $ 42,530,000 $ 43,492,000 $ 44,243,000 $ 53,514,000 $ 47,854,000 $ 42,592,000 $ 43,171,000 $ 43,317,000 $ 40,664,000 $ 146,624,000 $ 189,103,000 $ 169,744,000
Total tooling sales 15,607,000 7,520,000 2,193,000 2,938,000 3,072,000 3,806,000 1,342,000 1,745,000 1,822,000 420,000 2,807,000 411,000 28,258,000 9,965,000 5,460,000
Total net sales 49,072,000 41,336,000 39,006,000 45,468,000 46,564,000 48,049,000 54,856,000 49,599,000 44,414,000 43,591,000 46,124,000 41,075,000 174,882,000 199,068,000 175,204,000
Gross margin 7,157,000 5,581,000 6,323,000 8,863,000 7,934,000 8,311,000 10,982,000 9,025,000 7,795,000 8,147,000 7,599,000 6,645,000 27,924,000 36,252,000 30,186,000
Income before interest and taxes 3,139,000 1,657,000 2,307,000 4,442,000 3,474,000 3,902,000 6,232,000 4,890,000 3,954,000 3,704,000 3,873,000 3,116,000 11,545,000 18,498,000 14,647,000
Net income $ 2,032,000 $ 1,029,000 $ 1,460,000 $ 2,890,000 $ 2,331,000 $ 2,484,000 $ 4,039,000 $ 3,196,000 $ 2,566,000 $ 2,428,000 $ 2,520,000 $ 2,120,000 $ 7,411,000 $ 12,050,000 $ 9,634,000
Net income per common share:                              
Basic (USD per share) $ 0.27 $ 0.13 $ 0.19 $ 0.38 $ 0.31 $ 0.33 $ 0.53 $ 0.42 $ 0.34 $ 0.32 $ 0.34 $ 0.29 $ 0.97 $ 1.59 $ 1.28
Diluted (USD per share) $ 0.26 $ 0.13 $ 0.19 $ 0.38 $ 0.31 $ 0.33 $ 0.53 $ 0.42 $ 0.34 $ 0.32 $ 0.33 $ 0.28 $ 0.97 $ 1.58 $ 1.28