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Business Segment Information - Schedule of Business Segment Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Net sales:        
Total net sales $ 28,426 $ 29,703 $ 84,537 $ 94,610
Operating income (loss):        
Total operating income 2,082 4,266 9,471 14,179
Interest income 360 848 1,337 2,512
Income before taxes 2,442 5,114 10,808 16,691
Operating Segments | Security Products        
Net sales:        
Total net sales 21,209 23,405 65,251 75,036
Operating income (loss):        
Total operating income 2,797 4,866 11,871 15,990
Operating Segments | Marine Components        
Net sales:        
Total net sales 7,217 6,298 19,286 19,574
Operating income (loss):        
Total operating income 1,129 1,042 3,010 3,223
Corporate        
Operating income (loss):        
Total operating income $ (1,844) $ (1,642) $ (5,410) $ (5,034)