CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Oct. 01, 2016	Sep. 30, 2017	Oct. 01, 2016
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) [Abstract]
Net income	$ 2,230,481	$ 2,400,064	$ 5,214,024	$ 5,135,974
Other comprehensive income/(loss):
Change in foreign currency translation	378,509	(231,831)	1,262,332	(311,697)
Change in fair value marketable securities, net of tax benefit of: 2017 - $22,688 and $17,135, respectively $ 2016 -	31,379	0	41,548	0
Change in fair value of derivative financial instrument, net of tax benefit of: 2017 - $31,275 and $(10,406) 2016 - $ -	16,978	0	(51,027)	0
Change in pension and postretirement benefit costs, net of taxes of: 2017 - $338,592 and $112,865 respectively 2016 - $559,542 and $(105,703), respectively	206,682	192,456	620,048	(696,200)
Total other comprehensive income	633,548	(39,375)	1,872,901	(1,007,897)
Comprehensive income	$ 2,864,029	$ 2,630,689	$ 7,086,925	$ 4,128,077