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Business Segment Information - Schedule of Business Segment Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Net sales:        
Total net sales $ 27,107 $ 28,918 $ 54,182 $ 56,808
Operating income (loss):        
Total operating income 3,717 4,306 7,070 8,007
Interest income 41 8 73 16
Income before taxes 3,758 4,314 7,143 8,023
Operating Segments | Security Products        
Net sales:        
Total net sales 23,195 25,059 46,609 49,716
Operating income (loss):        
Total operating income 4,785 5,254 9,256 10,200
Operating Segments | Marine Components        
Net sales:        
Total net sales 3,912 3,859 7,573 7,092
Operating income (loss):        
Total operating income 555 606 889 866
Corporate        
Operating income (loss):        
Total operating income $ (1,623) $ (1,554) $ (3,075) $ (3,059)