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Quarterly Results of Operations (Unaudited) (Details) - USD ($)
 3 Months Ended 12 Months Ended
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, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Quarterly results of operations:                              
Total product sales $ 43,492,000 $ 44,243,000 $ 53,514,000 $ 47,854,000 $ 42,592,000 $ 43,171,000 $ 43,317,000 $ 40,664,000 $ 36,750,000 $ 32,342,000 $ 32,146,000 $ 32,858,000 $ 189,103,000 $ 169,744,000 $ 134,096,000
Total tooling sales 3,072,000 3,806,000 1,342,000 1,745,000 1,822,000 420,000 2,807,000 411,000 898,000 5,092,000 2,535,000 1,504,000 9,965,000 5,460,000 10,029,000
Total net sales 46,564,000 48,049,000 54,856,000 49,599,000 44,414,000 43,591,000 46,124,000 41,075,000 37,648,000 37,434,000 34,681,000 34,362,000 199,068,000 175,204,000 144,125,000
Gross margin 7,934,000 8,311,000 10,982,000 9,025,000 7,795,000 8,147,000 7,599,000 6,645,000 5,325,000 6,370,000 5,989,000 5,890,000 36,252,000 30,186,000 23,574,000
Income before interest and taxes 3,474,000 3,902,000 6,232,000 4,890,000 3,954,000 3,704,000 3,873,000 3,116,000 2,049,000 2,948,000 2,500,000 2,617,000 18,498,000 14,647,000 10,114,000
Net income $ 2,331,000 $ 2,484,000 $ 4,039,000 $ 3,196,000 $ 2,566,000 $ 2,428,000 $ 2,520,000 $ 2,120,000 $ 1,636,000 $ 1,960,000 $ 1,589,000 $ 1,681,000 $ 12,050,000 $ 9,634,000 $ 6,866,000
Net income per common share:                              
Basic (USD per share) $ 0.31 $ 0.33 $ 0.53 $ 0.42 $ 0.34 $ 0.32 $ 0.34 $ 0.29 $ 0.22 $ 0.27 $ 0.22 $ 0.24 $ 1.59 $ 1.28 $ 0.95
Diluted (USD per share) $ 0.31 $ 0.33 $ 0.53 $ 0.42 $ 0.34 $ 0.32 $ 0.33 $ 0.28 $ 0.22 $ 0.26 $ 0.21 $ 0.23 $ 1.58 $ 1.28 $ 0.92