Segment Information (Details) - USD ($)	3 Months Ended				6 Months Ended
	Jun. 27, 2020	Jun. 27, 2020	Jun. 29, 2019	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Revenues, sales to unaffiliated customers	$ 48,833,409	$ 48,833,409	$ 61,439,929	$ 61,439,929	$ 114,159,025	$ 122,323,077
Interest expense	(606,553)	(606,553)	(261,618)	(261,618)	(1,434,217)	(554,158)
Other income	416,917	416,917	586,823	586,823	603,322	600,748
Income before income taxes	(2,431,843)	(2,431,843)	3,284,498	3,284,498	1,346,557	5,340,191
Operating Profit (loss)	(2,242,207)	$ (2,242,207)	$ 2,959,293	2,959,293	2,177,452	5,293,601
Operating Segments [Member] | Metal Products [Member]
Revenues, sales to unaffiliated customers	3,847,502			7,446,278	9,552,029	15,243,079
Operating Profit (loss)	(932,418)			309,331	(1,347,441)	402,614
Operating Segments [Member] | Industrial Hardware [Member]
Revenues, sales to unaffiliated customers	33,871,790			37,490,953	81,108,395	75,894,296
Operating Profit (loss)	1,927,737			747,415	5,818,191	2,015,552
Operating Segments [Member] | Security Products [Member]
Revenues, sales to unaffiliated customers	11,114,117			16,502,698	23,498,601	31,185,702
Operating Profit (loss)	$ (3,237,527)			$ 1,902,547	$ (2,293,298)	$ 2,875,435