Segment Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Oct. 01, 2016	Sep. 30, 2017	Oct. 01, 2016
Segment Reporting Information [Line Items]
Revenues, sales to unaffiliated customers	$ 56,007,937	$ 33,478,347	$ 150,095,975	$ 103,463,316
Operating Profit	3,573,641	3,264,114	8,296,304	7,330,846
Interest expense	(327,206)	(28,817)	(659,884)	(97,486)
Other income	13,513	28,169	69,278	54,687
Income before income taxes	3,259,948	3,263,466	7,705,698	7,288,047
Operating Segments [Member] | Industrial Hardware [Member]
Segment Reporting Information [Line Items]
Revenues, sales to unaffiliated customers	32,959,599	15,210,943	83,500,656	45,689,104
Operating Profit	1,813,133	1,574,573	2,877,052	3,769,045
Operating Segments [Member] | Security Products [Member]
Segment Reporting Information [Line Items]
Revenues, sales to unaffiliated customers	16,115,356	13,648,701	46,232,410	43,722,828
Operating Profit	1,604,950	1,613,148	4,290,745	4,533,995
Operating Segments [Member] | Metal Products [Member]
Segment Reporting Information [Line Items]
Revenues, sales to unaffiliated customers	6,932,982	4,618,703	20,362,909	14,051,384
Operating Profit	$ 155,558	$ 76,393	$ 1,128,507	$ (972,194)