CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) [Abstract]
Net income	$ 2,529,773	$ 3,258,477	$ 4,100,733	$ 6,358,672
Other comprehensive income/(loss):
Change in foreign currency translation	(221,530)	(883,246)	191,094	(274,318)
Change in marketable securities, net of tax benefit/(cost) of: 2019 - $3,008 and $(463)	9,219	0	(1,420)	0
Change in fair value of interest rate swap, net of tax benefit/(cost) of: 2019 - $45,197 and $69,817 2018 - $19,202 and $59,166	(143,125)	60,806	(221,086)	226,645
Change in pension and postretirement benefit costs, net of taxes of: 2019 - $70,938 and $141,876 2018 - $65,843 and $131,685	222,681	222,724	445,362	445,449
Total other comprehensive income/(loss)	(132,755)	(599,716)	413,950	397,776
Comprehensive income	$ 2,397,018	$ 2,658,761	$ 4,514,683	$ 6,756,448