Segment Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Oct. 03, 2015	Sep. 27, 2014	Oct. 03, 2015	Sep. 27, 2014
Segment Reporting Information [Line Items]
Revenues, sales to unaffiliated customers	$ 36,239,500	$ 35,803,405	$ 110,154,039	$ 106,432,304
Operating Profit	3,449,621	3,748,873	5,677,126	8,833,930
Interest expense	(45,203)	(60,680)	(145,773)	(193,875)
Other income	6,573	14,030	33,540	37,996
Income before income taxes	3,410,991	3,702,223	5,564,893	8,678,051
Industrial Hardware [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues, sales to unaffiliated customers	16,327,856	15,006,948	46,234,468	44,202,346
Operating Profit	1,742,917	1,428,040	3,112,008	3,994,443
Security Products [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues, sales to unaffiliated customers	13,927,096	12,780,359	43,463,335	37,748,241
Operating Profit	1,236,581	1,643,159	2,672,875	3,088,610
Metal Products [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues, sales to unaffiliated customers	5,984,548	8,016,098	20,456,236	24,481,717
Operating Profit	$ 470,123	$ 677,674	$ (107,757)	$ 1,750,877