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Consolidated Statements of Income (Unaudited) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Net sales:        
Sales Revenue, Goods, Net $ 36,813,000 $ 53,514,000 $ 79,343,000 $ 101,368,000
Contracts Revenue 2,193,000 1,342,000 5,131,000 3,087,000
Total net sales 39,006,000 54,856,000 84,474,000 104,455,000
Total cost of sales 32,683,000 43,874,000 69,288,000 84,448,000
Gross margin 6,323,000 10,982,000 15,186,000 20,007,000
Total selling, general and administrative expense 4,016,000 4,750,000 8,437,000 8,885,000
Income before interest and taxes 2,307,000 6,232,000 6,749,000 11,122,000
Interest expense 74,000 100,000 166,000 141,000
Income before income taxes 2,233,000 6,132,000 6,583,000 10,981,000
Income tax expense $ 773,000 $ 2,093,000 2,233,000 3,746,000
Net income     $ 4,350,000 $ 7,235,000
Net income per common share:        
Basic (USD per share) $ 0.19 $ 0.53 $ 0.57 $ 0.96
Diluted (USD per share) $ 0.19 $ 0.53 $ 0.57 $ 0.95
Weighted average shares outstanding:        
Basic 7,617,000 7,578,000 7,602,000 7,570,000
Diluted 7,673,000 7,637,000 7,640,000 7,622,000