Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
CASH FLOWS FROM OPERATING ACTIVITIES:
Net (loss) income	$ (813,558)	$ 139,465
Adjustments to reconcile net (loss) income to net cash (used in) provided by operating activities:
Depreciation	639,997	758,834
Amortization	43,014	36,485
Stock based compensation	8,821	13,634
Net (gain) loss on sale and disposal of equipment	(8,482)	1,230
Deferred income taxes	(183,000)	39,000
Loss on intangible asset abandonment	92,833	0
Changes in working capital components:
Trade receivables	(219,503)	(24,955)
Inventories	(133,948)	39,477
Prepaid expenses and other assets	(531,554)	(207,120)
Income tax receivable	1,399	(652)
Accounts payable	114,113	325,668
Accrued expenses	512,837	103,699
Net cash (used in) provided by operating activities	(477,031)	1,224,765
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property and equipment	(478,353)	(543,145)
Proceeds from sales of equipment	15,596
Purchases of intangibles assets	(19,665)	(49,970)
Purchases of short-term investments	(5,635,000)	(5,615,000)
Proceeds on sale of short-term investments	6,125,000	5,815,000
Net cash provided by (used in) investing activities	7,578	(393,115)
CASH FLOWS FROM FINANCING ACTIVITIES:
Payment on long-term debt	(140,440)	(138,213)
Repurchase of common stock	(49,595)
Net cash used in financing activities	(190,035)	(138,213)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(659,488)	693,437
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	1,623,137	929,700
CASH AND CASH EQUIVALENTS AT END OF PERIOD	963,649	1,623,137
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Cash paid for interest	79,008	78,112
Cash paid for income taxes, net	$ 9,457	$ 7,652