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Quarterly Results of Operations (Unaudited) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Quarterly results of operations:                    
Total product sales $ 36,750 $ 32,342 $ 32,146 $ 32,858 $ 32,009 $ 32,149 $ 41,209 $ 44,331 $ 134,096 $ 149,698
Total tooling sales 898 5,092 2,535 1,504 3,687 5,532 3,335 198 10,029 12,752
Total net sales 37,648 37,434 34,681 34,362 35,696 37,681 44,544 44,529 144,125 162,450
Gross margin 5,325 6,370 5,989 5,890 6,202 4,989 7,026 7,631 23,574 25,848
Income before interest and taxes 2,049 2,948 2,500 2,617 3,076 1,957 3,439 4,018 10,114 12,490
Net income $ 1,636 $ 1,960 $ 1,589 $ 1,681 $ 2,063 $ 1,151 $ 2,341 $ 2,635 $ 6,866 $ 8,190
Net income per common share:                    
Basic (USD per share) $ 0.22 $ 0.27 $ 0.22 $ 0.24 $ 0.29 $ 0.16 $ 0.33 $ 0.37 $ 0.95 $ 1.15
Diluted (USD per share) $ 0.22 $ 0.26 $ 0.21 $ 0.23 $ 0.28 $ 0.16 $ 0.32 $ 0.36 $ 0.92 $ 1.11