CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)	3 Months Ended
	Mar. 31, 2018	Apr. 01, 2017
Operating Activities
Net income	$ 3,100,195	$ 1,517,141
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	1,150,204	955,614
Unrecognized pension and postretirement benefits	191,344	127,926
(Gain)/loss on sale of equipment and other assets	21,024	33,098
Provision for doubtful accounts	9,136	6,381
Issuance of Common Stock for directors' fees	107,099	41,509
Changes in operating assets and liabilities:
Accounts receivable	(3,514,532)	(1,719,513)
Inventories	(1,540,703)	1,689,822
Prepaid expenses and other	(144,757)	(84,755)
Other assets	(90,073)	(35,208)
Accounts payable	2,256,432	901,500
Accrued compensation	(2,012,189)	(1,321,648)
Other accrued expenses	562,695	279,730
Net cash provided by operating activities	95,875	2,391,597
Investing Activities
Marketable securities	0	(215,923)
Capitalized software	(733,842)	0
Purchases of property, plant and equipment	(605,655)	(487,169)
Net cash used in investing activities	(1,339,497)	(703,092)
Financing Activities
Principal payments on long-term debt	(4,387,500)	(357,142)
Dividends paid	(689,133)	(688,340)
Net cash used in financing activities	(5,076,633)	(1,045,482)
Effect of exchange rate changes on cash	406,594	212,902
Net change in cash and cash equivalents	(5,913,661)	855,925
Cash and cash equivalents at beginning of period	22,275,477	22,725,376
Cash and cash equivalents at end of period	$ 16,361,816	$ 23,581,301