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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, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Net sales:                      
Total net sales $ 25,100 $ 27,000 $ 30,000 $ 29,900 $ 26,300 $ 28,400 $ 27,100 $ 27,100 $ 112,035 $ 108,920 $ 108,994
Operating income (loss):                      
Total operating income $ 2,700 $ 3,400 $ 4,600 $ 4,500 $ 4,000 $ 4,500 $ 3,700 $ 3,400 15,235 15,574 13,971
Interest income                 1,929 390 50
Income before income taxes                 17,164 15,964 14,021
Depreciation and amortization                 3,673 3,698 3,536
Total capital expenditure                 2,796 3,175 4,218
Operating Segments | Security Products                      
Net sales:                      
Total net sales                 96,600 94,693 95,614
Operating income (loss):                      
Total operating income                 19,182 19,981 18,585
Depreciation and amortization                 3,072 3,025 2,831
Total capital expenditure                 2,389 3,017 3,805
Operating Segments | Marine Components                      
Net sales:                      
Total net sales                 15,435 14,227 13,380
Operating income (loss):                      
Total operating income                 1,342 1,707 1,433
Depreciation and amortization                 591 663 695
Total capital expenditure                 405 153 408
Corporate                      
Operating income (loss):                      
Total operating income                 (5,289) (6,114) (6,047)
Depreciation and amortization                 10 10 10
Total capital expenditure                 $ 2 $ 5 $ 5