Segment Information (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Segment Reporting Information [Abstract]
Revenues, sales to unaffiliated customers	$ 60,860,852	$ 58,044,743	$ 120,305,849	$ 94,088,038
Operating Profit	4,388,506	2,486,462	8,560,393	4,722,663
Interest expense	(312,060)	(311,654)	(608,390)	(332,678)
Other income	225,769	36,112	444,500	55,765
Income before income taxes	4,302,215	2,210,920	8,396,503	4,445,750
Operating Segments [Member] | Industrial Hardware [Member]
Segment Reporting Information [Abstract]
Revenues, sales to unaffiliated customers	35,853,583	35,098,231	72,410,627	50,541,057
Operating Profit	2,518,086	497,471	5,284,529	1,064,263
Operating Segments [Member] | Security Products [Member]
Segment Reporting Information [Abstract]
Revenues, sales to unaffiliated customers	17,888,028	16,199,567	33,007,356	30,117,055
Operating Profit	1,664,041	1,691,358	2,649,180	2,685,795
Operating Segments [Member] | Metal Products [Member]
Segment Reporting Information [Abstract]
Revenues, sales to unaffiliated customers	7,119,241	6,746,945	14,887,866	13,429,926
Operating Profit	$ 206,379	$ 297,633	$ 626,684	$ 972,605