Consolidated Statements of Comprehensive Income - USD ($)	12 Months Ended
	Dec. 28, 2019	Dec. 29, 2018
Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 13,266,142	$ 14,505,937
Other comprehensive income/(loss)
Change in foreign currency translation	68,377	(1,163,136)
Change in fair value of interest rate swap, net of tax benefit of: $26 in 2019 and $26,969 in 2018	574	124,687
Change in pension and other postretirement benefit costs, net of income taxes (expense)/benefit of: $664,279 in 2019 and $578,090 in 2018	(2,675,007)	(203,353)
Total other comprehensive income/(loss)	(2,606,056)	(1,241,802)
Comprehensive income/(loss)	$ 10,660,086	$ 13,264,135