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Business and Geographic Segments - Business Segment Information by Geographical Areas (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:                      
Net sales $ 27,400 $ 30,000 $ 32,400 $ 28,400 $ 25,100 $ 27,000 $ 30,000 $ 29,900 $ 118,217 $ 112,035 $ 108,920
Total assets 166,429       150,959       166,429 150,959 143,980
Operating Segments | Security Products                      
Net sales:                      
Net sales                 98,383 96,600 94,693
Total assets 74,714       72,961       74,714 72,961 73,345
Operating Segments | Marine Components                      
Net sales:                      
Net sales                 19,834 15,435 14,227
Total assets 14,189       11,704       14,189 11,704 12,209
Corporate and eliminations                      
Net sales:                      
Total assets $ 77,526       $ 66,294       77,526 66,294 58,426
Point Of Destination | United States                      
Net sales:                      
Net sales                 108,773 103,646 98,526
Point Of Destination | Canada                      
Net sales:                      
Net sales                 6,436 5,353 7,515
Point Of Destination | Mexico                      
Net sales:                      
Net sales                 1,438 1,486 1,315
Point Of Destination | Other                      
Net sales:                      
Net sales                 $ 1,570 $ 1,550 $ 1,564