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Business Segment Information (Detail) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Net sales:        
Total net sales $ 37,110,000 $ 35,736,000 $ 110,239,000 $ 105,755,000
Operating income:        
Total operating income 4,345,000 1,479,000 11,183,000 13,377,000
Other non-operating income, net 8,000 127,000 18,000 385,000
Interest expense (139,000) (218,000) (441,000) (617,000)
Income before income taxes 4,214,000 1,388,000 10,760,000 13,145,000
Security Products [Member]
        
Net sales:        
Total net sales 18,873,000 18,077,000 56,315,000 54,261,000
Operating income:        
Total operating income 3,758,000 3,550,000 10,899,000 10,911,000
Furniture Components [Member]
        
Net sales:        
Total net sales 15,828,000 15,588,000 46,383,000 44,630,000
Operating income:        
Total operating income 2,708,000 711,000 5,804,000 8,351,000
Marine Components [Member]
        
Net sales:        
Total net sales 2,409,000 2,071,000 7,541,000 6,864,000
Operating income:        
Total operating income (181,000) (252,000) (330,000) (664,000)
Corporate operating expense [Member]
        
Operating income:        
Total operating income $ (1,940,000) $ (2,530,000) $ (5,190,000) $ (5,221,000)