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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, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Net sales:                      
Net sales $ 25,700 $ 26,500 $ 28,900 $ 27,900 $ 24,700 $ 26,500 $ 26,800 $ 25,800 $ 108,994 $ 103,846 $ 92,045
Total assets 134,792       129,091       134,792 129,091 119,185
Operating Segments | Security Products                      
Net sales:                      
Net sales                 95,614 91,470 81,510
Total assets 72,561       70,244       72,561 70,244 68,110
Operating Segments | Marine Components                      
Net sales:                      
Net sales                 13,380 12,376 10,535
Total assets 12,761       9,951       12,761 9,951 9,782
Corporate and eliminations                      
Net sales:                      
Total assets $ 49,470       $ 48,896       49,470 48,896 41,293
Point Of Destination | United States                      
Net sales:                      
Net sales                 103,737 98,994 87,307
Point Of Destination | Canada                      
Net sales:                      
Net sales                 2,352 1,927 2,195
Point Of Destination | Mexico                      
Net sales:                      
Net sales                 1,334 1,124 1,129
Point Of Destination | Other                      
Net sales:                      
Net sales                 $ 1,571 $ 1,801 $ 1,414