Segment Information (Details) - USD ($)	3 Months Ended
Apr. 01, 2017	Apr. 02, 2016
Segment Reporting Information [Line Items]
Revenues, sales to unaffiliated customers	$ 36,043,295	$ 33,101,657
Operating Profit	2,236,201	960,864
Interest expense	(21,024)	(36,285)
Other income	19,653	21,374
Income before income taxes	2,234,830	945,953
Industrial Hardware [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues, sales to unaffiliated customers	15,442,825	14,591,513
Operating Profit	566,792	697,196
Security Products [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues, sales to unaffiliated customers	13,917,489	14,197,217
Operating Profit	994,437	1,128,196
Metal Products [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues, sales to unaffiliated customers	6,682,981	4,312,927
Operating Profit	$ 674,972	$ (864,528)

Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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