CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($)	3 Months Ended		9 Months Ended
	Oct. 02, 2021	Oct. 03, 2020	Oct. 02, 2021	Oct. 03, 2020
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED)
Net income	$ 5,961,528	$ 2,984,675	$ 7,343,020	$ 3,991,709
Other comprehensive (loss) income:
Change in foreign currency translation	(523,632)	277,618	(238,837)	(248,786)
Change in fair value of interest rate swap, net of tax cost (benefit) of: 2021 - $31,759 and $188,753 respectively; 2020 - $(35,587) and $547,087 respectively	104,949	113,180	602,224	(1,740,442)
Change in pension and postretirement benefit costs, net of taxes of:2021 - $107,962 and $308,117 respectively; 2020 - $81,144 and $243,429 respectively	346,328	260,295	988,401	780,886
Total other comprehensive (loss) income	(72,355)	651,093	1,351,788	(1,208,342)
Comprehensive income	$ 5,889,173	$ 3,635,768	$ 8,694,808	$ 2,783,367