CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)	3 Months Ended
	Mar. 30, 2019	Mar. 31, 2018
Operating Activities
Net income	$ 1,570,960	$ 3,100,195
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	1,438,799	1,150,204
Unrecognized pension and postretirement benefits	207,816	191,344
(Gain)/loss on sale of equipment and other assets	671,137	21,024
Provision for doubtful accounts	25,711	9,136
Stock compensation expense	104,992	107,099
Changes in operating assets and liabilities:
Accounts receivable	(2,123,227)	(3,514,532)
Inventories	1,313,875	(1,540,703)
Prepaid expenses and other	(81,231)	(144,757)
Other assets	101,919	(90,073)
Accounts payable	(27,186)	2,256,432
Accrued compensation	(1,724,968)	(2,012,189)
Other accrued expenses	11,718	562,695
Net cash provided by operating activities	1,490,316	95,875
Investing Activities
Marketable securities	(91,400)	0
Capitalized software	(104,484)	(733,842)
Purchases of property, plant and equipment	(743,622)	(605,655)
Net cash used in investing activities	(939,506)	(1,339,479)
Financing Activities
Principal payments on long-term debt	(387,500)	(4,387,500)
Dividends paid	(686,740)	(689,133)
Net cash used in financing activities	(1,074,240)	(5,076,633)
Effect of exchange rate changes on cash	144,954	406,594
Net change in cash and cash equivalents	(378,476)	(5,913,661)
Cash and cash equivalents at beginning of period	13,925,765	22,275,477
Cash and cash equivalents at end of period	13,547,289	$ 16,361,816
Non-cash investing and financing activities
Right of use asset	10,623,392
Lease liability	$ (10,623,392)