Segment Information (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jul. 01, 2017	Jul. 02, 2016	Jul. 01, 2017	Jul. 02, 2016
Segment Reporting Information [Line Items]
Revenues, sales to unaffiliated customers	$ 58,044,743	$ 36,883,312	$ 94,088,038	$ 69,984,969
Operating Profit	2,486,462	3,105,868	4,722,663	4,066,732
Interest expense	(311,654)	(32,384)	(332,678)	(68,669)
Other income	36,112	5,144	55,765	26,518
Income before income taxes	2,210,920	3,078,628	4,445,750	4,024,581
Operating Segments [Member] | Industrial Hardware [Member]
Segment Reporting Information [Line Items]
Revenues, sales to unaffiliated customers	35,098,231	15,886,648	50,541,057	30,478,161
Operating Profit	497,471	1,497,277	1,064,263	2,194,472
Operating Segments [Member] | Security Products [Member]
Segment Reporting Information [Line Items]
Revenues, sales to unaffiliated customers	16,199,567	15,876,910	30,117,055	30,074,127
Operating Profit	1,691,358	1,792,650	2,685,795	2,920,847
Operating Segments [Member] | Metal Products [Member]
Segment Reporting Information [Line Items]
Revenues, sales to unaffiliated customers	6,746,945	5,119,754	13,429,926	9,432,681
Operating Profit	$ 297,633	$ (184,059)	$ 972,605	$ (1,048,587)