Segment Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Oct. 01, 2016	Oct. 03, 2015	Oct. 01, 2016	Oct. 03, 2015
Segment Reporting Information [Line Items]
Revenues, sales to unaffiliated customers	$ 33,478,347	$ 36,239,500	$ 103,463,316	$ 110,154,039
Operating Profit	3,264,114	3,449,621	7,330,846	5,677,126
Interest expense	(28,817)	(45,203)	(97,486)	(145,773)
Other income	28,169	6,573	54,687	33,540
Income before income taxes	3,263,466	3,410,991	7,288,047	5,564,893
Industrial Hardware [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues, sales to unaffiliated customers	15,210,943	16,327,856	45,689,104	46,234,468
Operating Profit	1,574,573	1,742,917	3,769,045	3,112,008
Security Products [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues, sales to unaffiliated customers	13,648,701	13,927,096	43,722,828	43,463,335
Operating Profit	1,613,148	1,236,581	4,533,995	2,672,875
Metal Products [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues, sales to unaffiliated customers	4,618,703	5,984,548	14,051,384	20,456,236
Operating Profit	$ 76,393	$ 470,123	$ (972,194)	$ (107,757)