Consolidated Statements of Shareholders' Equity - USD ($)	Total	Common Stock	Treasury Stock	Retained Earnings (Accumulated Deficit)	Accumulated other comprehensive loss
Balance, shares at Dec. 29, 2018		8,965,987	(2,734,729)
Balance, amount at Dec. 29, 2018	$ 96,868,639	$ 29,994,890	$ (20,169,098)	$ 109,671,362	$ (22,628,515)
Net income	13,266,142			13,266,142
Cash dividends declared, $.44 per share	(2,748,393)			(2,748,393)
Currency translation adjustment	68,377				68,377
Change in fair value of interest rate swap	574				574
Change in pension and other postretirement benefit costs, net of tax	(2,675,007)				(2,675,007)
Issuance of SARS, shares		151
Issuance of SARS, amount	397,250	$ 397,250
Issuance of Common Stock for directors' fees, shares		9,296
Issuance of Common Stock for directors' fees, amount	259,675	$ 259,675
Balance, shares at Dec. 28, 2019		8,975,434	(2,734,729)
Balance, amount at Dec. 28, 2019	105,437,257	$ 30,651,815	$ (20,169,098)	120,189,111	(25,234,571)
Net income	5,405,522			5,405,522
Cash dividends declared, $.44 per share	(2,754,502)			(2,754,502)
Currency translation adjustment	2,991,816				2,991,816
Change in fair value of interest rate swap	(1,558,610)				(1,558,610)
Change in pension and other postretirement benefit costs, net of tax	(5,695,386)				(5,695,386)
Issuance of Common Stock for directors' fees, shares		21,191
Issuance of Common Stock for directors' fees, amount	473,143	$ 473,143
Treasury stock purchases, shares			(15,000)
Treasury stock purchases, amount	(368,864)		$ (368,864)
Issuance of SARS	376,083	$ 376,083
Balance, shares at Jan. 02, 2021		8,996,625	(2,749,729)
Balance, amount at Jan. 02, 2021	$ 104,306,459	$ 31,501,041	$ (20,537,962)	$ 122,840,131	$ (29,496,751)