CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)	3 Months Ended
	Apr. 03, 2021	Mar. 28, 2020
Operating Activities
Net income	$ 5,840,827	$ 2,895,817
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	2,192,622	2,055,782
Unrecognized pension and postretirement benefits	(674,262)	(678,305)
(Gain) loss on sale of equipment and other assets	(1,600,288)	(437,446)
Provision for doubtful accounts	73,097	156,286
Stock compensation expense	278,258	238,293
Changes in operating assets and liabilities:
Accounts receivable	(4,551,399)	(2,273,864)
Inventories	(1,015,663)	(994,546)
Prepaid expenses and other	(744,138)	341,582
Other assets	(156,726)	(415,415)
Accounts payable	2,063,182	2,766,829
Accrued compensation	(1,159,489)	(1,585,976)
Other accrued expenses	1,554,036	(564,572)
Net cash provided by operating activities	2,100,057	1,504,465
Investing Activities
Marketable securities	(273)	11,151
Payments received from notes receivable	68,325	0
Proceeds from sale of equipment	1,994,017	445,212
Purchases of property, plant and equipment	(919,589)	(828,115)
Net cash provided by/used in investing activities	1,142,480	(371,752)
Financing Activities
Principal payments on long-term debt	(1,162,045)	(1,221,423)
Lease payments	(9,875)	0
Purchase common stock for treasury	0	(368,864)
Dividends paid	(684,702)	(686,614)
Net cash used in financing activities	(1,856,622)	(2,276,901)
Effect of exchange rate changes on cash	(22,881)	(343,436)
Net change in cash and cash equivalents	1,363,034	(1,487,624)
Cash and cash equivalents at beginning of period	16,101,635	17,996,505
Cash and cash equivalents at end of period	17,464,669	16,508,881
Supplemental disclosure of cash flow information:
Interest	685,520	827,664
Income taxes	21,100	21,000
Non-cash investing and financing activities
Right of use asset	114,471	(489,822)
Lease liability	$ (104,595)	$ 489,822