Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
OPERATING ACTIVITIES
Net income (loss)	$ 827,408	$ (255,041)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	283,268	860,743
Amortization of lease cost in excess of cash paid in accordance with ASU 2016-02	9,048	18,945
Deferred income taxes (benefit)	0	(81,983)
(Increase) decrease in:
Accounts receivable	(153,156)	(132,609)
Inventories	2,068	(14,655)
Prepaid expenses	(81,992)	(58,185)
Other assets including long-term portion of receivables	(30,416)	(209,304)
(Decrease) increase in:
Accounts payable and accrued expenses	(155,772)	(147,794)
Net cash provided by (used in) operating activities	700,456	(19,883)
INVESTING ACTIVITIES
Purchase of property and equipment	(22,105)	(555,637)
Net cash (used) in investing activities	(22,105)	(555,637)
FINANCING ACTIVITIES
Payment of principal on bank term loans	0	(4,297,024)
Payment of principal on convertible notes	0	(1,275,000)
Proceeds of new loan - Corbel	0	7,069,137
Net cash provided by financing activities	0	1,497,113
Increase in cash	678,351	921,593
Cash at beginning of period	1,194,363	218,132
Cash at end of period	1,872,714	1,139,725
Supplemental schedule of investing and financing activities
Cash paid for interest	$ 221,220	$ 198,560