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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, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Net sales:                      
Net sales $ 29,600 $ 29,700 $ 33,700 $ 31,200 $ 27,400 $ 30,000 $ 32,400 $ 28,400 $ 124,243 $ 118,217 $ 112,035
Total assets 178,544       166,429       178,544 166,429 150,959
Operating Segments | Security Products                      
Net sales:                      
Net sales                 99,328 98,383 96,600
Total assets 73,697       74,714       73,697 74,714 72,961
Operating Segments | Marine Components                      
Net sales:                      
Net sales                 24,915 19,834 15,435
Total assets 15,256       14,189       15,256 14,189 11,704
Corporate and eliminations                      
Net sales:                      
Total assets $ 89,591       $ 77,526       89,591 77,526 66,294
Point Of Destination | United States                      
Net sales:                      
Net sales                 114,186 108,773 103,646
Point Of Destination | Canada                      
Net sales:                      
Net sales                 7,257 6,436 5,353
Point Of Destination | Mexico                      
Net sales:                      
Net sales                 922 1,438 1,486
Point Of Destination | Other                      
Net sales:                      
Net sales                 $ 1,878 $ 1,570 $ 1,550