Statements of Cash Flows (Unaudited) - USD ($)	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	$ (300,190)	$ (888,059)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation	1,232,222	1,123,382
Amortization of intangible assets	9,552	9,552
Amortization and write-off of debt issuance costs	3,920	99,513
Deferred income taxes		(14,632)
Stock-based compensation	57,894	134,038
(Gain) loss on disposal of fixed assets	(10,000)	3,266
Non-cash rent expense	5,358	5,920
Changes in:
Trade accounts receivable	(253,145)	654,318
Accrued interest income	495	27,655
Inventory	(328,348)	624,852
Prepaid expenses and other current assets	(39,512)	7,723
Other assets	782	3,180
Accounts payable and accrued expenses	(271,742)	35,949
Net cash provided by operating activities	107,286	1,826,657
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of property, plant and equipment	(1,228,655)	(2,314,736)
Maturities of investments	996,000	461,000
Proceeds from sale of fixed assets	10,000	600
Net cash used for investing activities	(222,655)	(1,853,136)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from public offering, net	4,233,026
Proceeds from debt issuance		10,037,700
Debt principal repayments	(381,008)	(8,660,972)
Payments of debt issuance costs	2,272	(39,789)
Proceeds from exercise of stock options	11,693
Net cash provided by financing activities	3,865,983	1,336,939
NET INCREASE IN CASH AND CASH EQUIVALENTS	3,750,614	1,310,460
BEGINNING CASH AND CASH EQUIVALENTS	6,949,937	6,293,293
ENDING CASH AND CASH EQUIVALENTS	10,700,551	7,603,753
CASH PAID FOR:
Income taxes	5,125	4,700
Interest expense	157,418	332,916
NON-CASH ACTIVITIES:
Change in capital expenditures included in accounts payable and accrued expenses	(74,439)	(19,867)
Net change in fair value of interest rate swaps, net of taxes		$ (43,895)