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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, 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:                      
Net sales $ 26,300 $ 28,400 $ 27,100 $ 27,100 $ 25,700 $ 26,500 $ 28,900 $ 27,900 $ 108,920 $ 108,994 $ 103,846
Total assets 143,980       134,792       143,980 134,792 129,091
Operating Segments | Security Products                      
Net sales:                      
Net sales                 94,693 95,614 91,470
Total assets 73,345       72,561       73,345 72,561 70,244
Operating Segments | Marine Components                      
Net sales:                      
Net sales                 14,227 13,380 12,376
Total assets 12,209       12,761       12,209 12,761 9,951
Corporate and eliminations                      
Net sales:                      
Total assets $ 58,426       $ 49,470       58,426 49,470 48,896
Point Of Destination | United States                      
Net sales:                      
Net sales                 98,526 103,737 98,994
Point Of Destination | Canada                      
Net sales:                      
Net sales                 7,515 2,352 1,927
Point Of Destination | Mexico                      
Net sales:                      
Net sales                 1,315 1,334 1,124
Point Of Destination | Other                      
Net sales:                      
Net sales                 $ 1,564 $ 1,571 $ 1,801