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Business and Geographic Segments - Schedule of Business Segment Information (Detail) - USD ($)
$ in Thousands
 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, 2015
Dec. 31, 2014
Dec. 31, 2013
Net sales:                      
Total net sales $ 25,700 $ 26,500 $ 28,900 $ 27,900 $ 24,700 $ 26,500 $ 26,800 $ 25,800 $ 108,994 $ 103,846 $ 92,045
Operating income (loss):                      
Total operating income $ 2,600 $ 3,400 $ 4,300 $ 3,700 $ 3,000 $ 3,400 $ 3,900 $ 3,300 13,971 13,607 9,328
Other non-operating income, net                 50 66 40
Interest expense                     (127)
Income before income taxes                 14,021 13,673 9,241
Depreciation and amortization                 3,536 3,533 3,270
Total capital expenditure                 4,218 2,825 3,501
Operating Segments | Security Products                      
Net sales:                      
Total net sales                 95,614 91,470 81,510
Operating income (loss):                      
Total operating income                 18,585 18,740 16,142
Depreciation and amortization                 2,831 2,771 2,460
Total capital expenditure                 3,805 2,571 3,171
Operating Segments | Marine Components                      
Net sales:                      
Total net sales                 13,380 12,376 10,535
Operating income (loss):                      
Total operating income                 1,433 705 (148)
Depreciation and amortization                 695 732 741
Total capital expenditure                 408 250 310
Corporate                      
Operating income (loss):                      
Total operating income                 (6,047) (5,838) (6,666)
Depreciation and amortization                 10 30 69
Total capital expenditure                 $ 5 $ 4 $ 20