Statements of Cash Flows (Unaudited) - USD ($)		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss		$ (888,059)	$ (482,600)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation		1,123,382	1,128,327
Amortization of intangible assets		9,552	9,552
Amortization and write-off of debt issuance costs		99,513	8,488
Deferred income taxes		(14,632)	24,356
Stock-based compensation		134,038	152,916
Loss on disposal of fixed assets		3,266
Non-cash rent expense		5,920
Changes in:
Trade accounts receivable, gross		654,318	805
Accrued interest income		27,655	(38,329)
Inventory		624,852	(160,723)
Prepaid expenses and other current assets		7,723	(21,776)
Other assets		3,180	5,985
Accounts payable and accrued expenses		35,949	(280,462)
Net cash provided by operating activities		1,826,657	346,539
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of property, plant and equipment		(2,314,736)	(300,136)
Maturities (purchases) of investments		461,000	(8,637,000)
Proceeds from sale of fixed assets		600
Payment of contingent royalties related to 2016 acquisition			(8,914)
Net cash used for investing activities		(1,853,136)	(8,946,050)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from public offering, net			8,303,436
Proceeds from debt issuance		10,037,700
Line of credit repayment			(500,000)
Debt principal repayments		(8,660,972)	(428,961)
Payments of debt issuance costs		(39,789)
Proceeds from exercise of stock options			2
Net cash provided by financing activities		1,336,939	7,374,477
NET INCREASE (DECREASE) IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH		1,310,460	(1,225,034)
BEGINNING CASH, CASH EQUIVALENTS AND RESTRICTED CASH		6,293,293	2,521,050
ENDING CASH, CASH EQUIVALENTS AND RESTRICTED CASH	[1]	7,603,753	1,296,016
CASH PAID FOR:
Income taxes		4,700	4,700
Interest expense		332,916	220,178
NON-CASH ACTIVITIES:
Change in capital expenditures included in accounts payable and accrued expenses		150,358	(69,486)
Net change in fair value of interest rate swaps, net of taxes		(43,895)	73,069
Fixed asset disposals, gross		21,611	6,394
Operating lease right-of-use asset and operating lease liability		1,318,945
Cash and cash equivalents		6,202,663	1,296,016
Restricted cash		1,401,090
Cash, cash equivalents and restricted cash	[1]	$ 7,603,753	$ 1,296,016

[1] This amount does not include $1,992,098 and $8,675,329 of short-term investments as of June 30, 2020 and 2019, respectively.