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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, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Net sales:                      
Total net sales $ 26,300 $ 28,400 $ 27,100 $ 27,100 $ 25,700 $ 26,500 $ 28,900 $ 27,900 $ 108,920 $ 108,994 $ 103,846
Operating income (loss):                      
Total operating income $ 4,000 $ 4,500 $ 3,700 $ 3,400 $ 2,600 $ 3,400 $ 4,300 $ 3,700 15,574 13,971 13,607
Interest income                 390 50 66
Income before income taxes                 15,964 14,021 13,673
Depreciation and amortization                 3,698 3,536 3,533
Total capital expenditure                 3,175 4,218 2,825
Operating Segments | Security Products                      
Net sales:                      
Total net sales                 94,693 95,614 91,470
Operating income (loss):                      
Total operating income                 19,981 18,585 18,740
Depreciation and amortization                 3,025 2,831 2,771
Total capital expenditure                 3,017 3,805 2,571
Operating Segments | Marine Components                      
Net sales:                      
Total net sales                 14,227 13,380 12,376
Operating income (loss):                      
Total operating income                 1,707 1,433 705
Depreciation and amortization                 663 695 732
Total capital expenditure                 153 408 250
Corporate                      
Operating income (loss):                      
Total operating income                 (6,114) (6,047) (5,838)
Depreciation and amortization                 10 10 30
Total capital expenditure                 $ 5 $ 5 $ 4