Segment Information (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jul. 04, 2015	Jun. 28, 2014	Jul. 04, 2015	Jun. 28, 2014
Segment Reporting Information [Line Items]
Revenues, sales to unaffiliated customers	$ 37,037,697	$ 34,779,773	$ 73,914,539	$ 70,628,899
Operating Profit	856,022	2,787,940	2,227,505	5,085,057
Interest expense	(47,745)	(64,626)	(100,570)	(133,195)
Other income	19,960	16,683	26,967	23,966
Income before income taxes	828,237	2,739,997	2,153,902	4,975,828
Industrial Hardware [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues, sales to unaffiliated customers	15,119,946	15,064,647	29,906,612	29,195,398
Operating Profit	637,546	1,470,569	1,369,091	2,566,403
Security Products [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues, sales to unaffiliated customers	15,435,324	12,420,846	29,536,240	24,967,882
Operating Profit	650,002	890,165	1,436,293	1,445,451
Metal Products [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues, sales to unaffiliated customers	6,482,427	7,294,280	14,471,687	16,465,619
Operating Profit	$ (431,526)	$ 427,206	$ (577,879)	$ 1,073,203