Condensed Statements of Cash Flows (Unaudited) - USD ($)	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
CASH FLOWS FROM OPERATING ACTIVITIES:
Net (loss) income	$ (570,742)	$ 14,598
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:
Depreciation	321,062	395,787
Amortization	24,308	18,615
Stock based compensation	3,840	6,473
Net gain on sale and disposal of property and equipment	(8,481)
Deferred income taxes		12,839
Loss on intangible asset abandonment	71,600
Changes in working capital components:
Trade receivables	(8,230)	321,347
Inventories	(465,661)	(385,481)
Prepaid expenses and other assets	113,037	(16,184)
Income tax receivable	(182,451)	(1,365)
Accounts payable	(114,104)	508,323
Accrued expenses	46,897	2,962
Net cash (used in) provided by operating activities	(768,925)	877,914
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property and equipment	(230,570)	(324,392)
Proceeds from sales of property and equipment	15,596
Purchases of intangibles assets	(6,322)	(32,354)
Purchases of short-term investments	(3,185,000)	(2,920,000)
Proceeds on sale of short-term investments	2,940,000	2,895,000
Net cash used in investing activities	(466,296)	(381,746)
CASH FLOWS FROM FINANCING ACTIVITIES:
Payment on long-term debt	(69,761)	(70,040)
Repurchase of common stock	(20,969)
Net cash used in financing activities	(90,730)	(70,040)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(1,325,951)	426,128
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	1,623,137	929,700
CASH AND CASH EQUIVALENTS AT END OF PERIOD	297,186	1,355,828
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Cash paid for interest	39,812	36,711
Cash paid for income taxes, net	$ 9,315	$ 7,652