Condensed Statements of Cash Flows (Unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	$ (455,031)	$ (130,738)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:
Depreciation	162,033	199,906
Amortization	8,932	9,442
Stock based compensation	1,920	2,893
Net gain on sale and disposal of property, plant and equipment	(7,487)
Deferred income taxes		12,839
Loss on intangible asset abandonment	343
Changes in working capital components:
Trade receivables	394,101	158,353
Inventories	(793,588)	(282,766)
Prepaid expenses and other assets	115,523	(25,586)
Income tax receivable	(110,553)	(40,622)
Accounts payable	212,578	286,829
Accrued expenses	(146,767)	(77,854)
Net cash (used in) provided by operating activities	(617,996)	112,696
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property, plant and equipment	(117,075)	(49,004)
Proceeds from sales of property and equipment	12,396
Purchases of intangibles assets	(2,797)	(15,572)
Purchases of short-term investments	(1,715,000)	(1,205,000)
Proceeds on sale of short-term investments	1,470,000	1,425,000
Net cash (used in) provided by investing activities	(352,476)	155,424
CASH FLOWS FROM FINANCING ACTIVITIES:
Payment on long-term debt	(35,419)	(35,632)
Net cash used in financing activities	(35,419)	(35,632)
NET (DECREASE) INCREADE IN CASH AND CASH EQUIVALENTS	(1,005,891)	232,488
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	1,623,137	929,700
CASH AND CASH EQUIVALENTS AT END OF PERIOD	617,246	1,162,188
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Cash paid for interest	19,367	17,038
Cash paid for income taxes, net	$ 7,815	$ 7,367