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Business Segment Information - Schedule of Business Segment Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Net sales:    
Total net sales $ 28,413 $ 29,948
Operating income (loss):    
Total operating income 4,373 4,524
Interest income 572 335
Income before taxes 4,945 4,859
Operating Segments | Security Products    
Net sales:    
Total net sales 24,056 26,010
Operating income (loss):    
Total operating income 5,612 5,691
Operating Segments | Marine Components    
Net sales:    
Total net sales 4,357 3,938
Operating income (loss):    
Total operating income 586 371
Corporate    
Operating income (loss):    
Total operating income $ (1,825) $ (1,538)