CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($)	3 Months Ended		6 Months Ended
	Jul. 03, 2021	Jun. 27, 2020	Jul. 03, 2021	Jun. 27, 2020
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED)
Net (loss) income	$ (4,473,774)	$ (1,888,781)	$ 1,381,491	$ 1,007,036
Other comprehensive income/(loss):
Change in foreign currency translation	363,848	765,195	284,795	(526,404)
Change in marketable securities, net of taxes of: 2021 - $(25) and $42 respectively; 2020 - $679 and $(2,063) respectively	(77)	2,083	128	(6,325)
Change in fair value of interest rate swap, net of tax cost (benefit) of: 2021 - $26,560 and $156,994 respectively; 2020 - $48,169 and $582,673 respectively	84,107	(152,519)	497,147	(1,847,297)
Change in pension and postretirement benefit costs, net of taxes of: 2021 - $107,961 and $200,155 respectively; 2020 - $81,142 and $162,285 respectively	346,329	260,295	642,073	520,591
Total other comprehensive income (loss)	794,207	875,054	1,424,143	(1,859,435)
Comprehensive (loss) income	$ (3,679,567)	$ (1,013,727)	$ 2,805,634	$ (852,399)