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Statements of Cash Flows (Unaudited) - USD ($)
 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net loss $ (1,210,947) $ (985,136)
Adjustments to reconcile net loss to net cash provided by operating activities:    
Depreciation 1,719,393 1,691,049
Amortization of intangible assets 14,328 14,328
Amortization and write-off of debt issuance costs 101,077 12,732
Deferred income taxes (14,632) 31,796
Stock-based compensation 196,435 221,569
Loss on disposal of fixed assets 3,266 2,469
Non-cash rent expense 10,889
Changes in:    
Trade accounts receivable 94,620 45,593
Accrued interest income 27,215 (52,947)
Inventory 427,439 (349,402)
Prepaid expenses and other current assets (133,594) (116,456)
Other assets 1,622 (16,292)
Accounts payable and accrued expenses (77,781) (219,170)
Net cash provided by operating activities 1,159,330 280,133
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of property, plant and equipment (3,787,860) (700,017)
Maturities of investments 2,453,000 2,976,000
Purchases of investments (1,992,000) (10,123,000)
Proceeds from sale of fixed assets 600
Payment of contingent royalties related to 2016 acquisition (8,914)
Proceeds from sale of assets 250,000
Net cash used for investing activities (3,326,260) (7,605,931)
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 (8,804,147) (644,129)
Payments of debt issuance costs (39,789)
Proceeds from exercise of stock options 2
Net cash provided by financing activities 1,193,764 7,159,309
NET DECREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH (973,166) (166,489)
BEGINNING CASH, CASH EQUIVALENTS AND RESTRICTED CASH 6,293,293 2,521,050
ENDING CASH, CASH EQUIVALENTS AND RESTRICTED CASH 5,320,127 2,354,561
CASH PAID FOR:    
Income taxes 4,700 4,700
Interest expense 408,131 325,343
NON-CASH ACTIVITIES:    
Change in capital expenditures included in accounts payable and accrued expenses (150,295) (55,200)
Net change in fair value of interest rate swaps, net of taxes (43,895) 95,387
Fixed asset disposals, gross 100,390 11,164
Operating lease right-of-use asset and operating lease liability 1,313,698
Cash and cash equivalents 3,918,157 2,354,561
Restricted cash 1,401,970
Cash, cash equivalents and restricted cash [1] $ 5,320,127 $ 2,354,561
[1] This amount does not include $1,992,538 and $7,199,947 of short-term investments as of September 30, 2020 and 2019, respectively.