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Business Segment Information - Schedule of Business Segment Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Net sales:        
Total net sales $ 28,404 $ 26,505 $ 82,586 $ 83,314
Operating income (loss):        
Total operating income 4,473 3,434 11,543 11,441
Interest income 88 16 161 32
Income before taxes 4,561 3,450 11,704 11,473
Operating Segments | Security Products        
Net sales:        
Total net sales 24,680 23,115 71,289 72,831
Operating income (loss):        
Total operating income 5,421 4,455 14,676 14,656
Operating Segments | Marine Components        
Net sales:        
Total net sales 3,724 3,390 11,297 10,483
Operating income (loss):        
Total operating income 547 422 1,436 1,288
Corporate        
Operating income (loss):        
Total operating income $ (1,495) $ (1,443) $ (4,569) $ (4,503)