Segment Information (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jul. 02, 2016	Jul. 04, 2015	Jul. 02, 2016	Jul. 04, 2015
Segment Reporting Information [Line Items]
Revenues, sales to unaffiliated customers	$ 36,883,312	$ 37,037,697	$ 69,984,969	$ 73,914,539
Operating Profit	3,105,868	856,022	4,066,732	2,227,505
Interest expense	(32,384)	(47,745)	(68,669)	(100,570)
Other income	5,144	19,960	26,518	26,967
Income before income taxes	3,078,628	828,237	4,024,581	2,153,902
Industrial Hardware [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues, sales to unaffiliated customers	15,886,648	15,119,946	30,478,161	29,906,612
Operating Profit	1,497,277	637,546	2,194,472	1,369,091
Security Products [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues, sales to unaffiliated customers	15,876,910	15,435,324	30,074,127	29,536,240
Operating Profit	1,792,650	650,002	2,920,847	1,436,293
Metal Products [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues, sales to unaffiliated customers	5,119,754	6,482,427	9,432,681	14,471,687
Operating Profit	$ (184,059)	$ (431,526)	$ (1,048,587)	$ (577,879)