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Business Segment Information - Schedule of Business Segment Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Net sales:        
Total net sales $ 30,029 $ 26,992 $ 90,827 $ 86,943
Operating income (loss):        
Total operating income 4,520 3,368 14,879 12,494
Interest income 697 546 1,908 1,363
Income before taxes 5,217 3,914 16,787 13,857
Operating Segments | Security Products        
Net sales:        
Total net sales 24,541 22,854 75,845 74,903
Operating income (loss):        
Total operating income 5,335 4,249 17,761 15,301
Operating Segments | Marine Components        
Net sales:        
Total net sales 5,488 4,138 14,982 12,040
Operating income (loss):        
Total operating income 812 417 2,335 1,284
Corporate        
Operating income (loss):        
Total operating income $ (1,627) $ (1,298) $ (5,217) $ (4,091)