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Business Segment Information - Schedule of Business Segment Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Net sales:        
Total net sales $ 29,703 $ 30,029 $ 94,610 $ 90,827
Operating income (loss):        
Total operating income 4,266 4,520 14,179 14,879
Interest income 848 697 2,512 1,908
Income before taxes 5,114 5,217 16,691 16,787
Operating Segments | Security Products        
Net sales:        
Total net sales 23,405 24,541 75,036 75,845
Operating income (loss):        
Total operating income 4,866 5,335 15,990 17,761
Operating Segments | Marine Components        
Net sales:        
Total net sales 6,298 5,488 19,574 14,982
Operating income (loss):        
Total operating income 1,042 812 3,223 2,335
Corporate        
Operating income (loss):        
Total operating income $ (1,642) $ (1,627) $ (5,034) $ (5,217)