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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, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Net sales:                      
Total net sales $ 27,400 $ 30,000 $ 32,400 $ 28,400 $ 25,100 $ 27,000 $ 30,000 $ 29,900 $ 118,217 $ 112,035 $ 108,920
Operating income (loss):                      
Total operating income $ 2,900 $ 4,500 $ 6,000 $ 4,400 $ 2,700 $ 3,400 $ 4,600 $ 4,500 17,811 15,235 15,574
Interest income                 2,664 1,929 390
Income before income taxes                 20,475 17,164 15,964
Depreciation and amortization                 3,454 3,673 3,698
Total capital expenditure                 3,117 2,796 3,175
Operating Segments | Security Products                      
Net sales:                      
Total net sales                 98,383 96,600 94,693
Operating income (loss):                      
Total operating income                 21,947 19,182 19,981
Depreciation and amortization                 2,914 3,072 3,025
Total capital expenditure                 2,126 2,389 3,017
Operating Segments | Marine Components                      
Net sales:                      
Total net sales                 19,834 15,435 14,227
Operating income (loss):                      
Total operating income                 2,738 1,342 1,707
Depreciation and amortization                 535 591 663
Total capital expenditure                 991 405 153
Corporate                      
Operating income (loss):                      
Total operating income                 (6,874) (5,289) (6,114)
Depreciation and amortization                 $ 5 10 10
Total capital expenditure                   $ 2 $ 5