Segment Information (Details) - USD ($)	3 Months Ended
	Mar. 30, 2019	Mar. 31, 2018
Segment Reporting Information [Abstract]
Revenues, sales to unaffiliated customers	$ 60,883,148	$ 59,444,997
Operating Profit	2,334,308	4,171,887
Interest expense	(292,540)	(296,330)
Other income	13,925	218,731
Income before income taxes	2,055,693	4,094,288
Operating Segments [Member] | Industrial Hardware [Member]
Segment Reporting Information [Abstract]
Revenues, sales to unaffiliated customers	38,403,343	36,557,043
Operating Profit	1,268,140	2,766,444
Operating Segments [Member] | Security Products [Member]
Segment Reporting Information [Abstract]
Revenues, sales to unaffiliated customers	14,683,004	15,119,328
Operating Profit	972,887	985,138
Operating Segments [Member] | Metal Products [Member]
Segment Reporting Information [Abstract]
Revenues, sales to unaffiliated customers	7,796,801	7,768,626
Operating Profit	$ 93,281	$ 420,305