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Statements of Cash Flows (Unaudited) - USD ($)
9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net loss $ (825,939) $ (152,426)
Adjustments to reconcile net loss to net cash (used for) provided by operating activities:    
Depreciation 1,869,000 1,845,612
Amortization of intangible assets 14,328 14,328
Amortization and write-off of debt issuance costs 5,739 5,880
Stock-based compensation 200,849 103,382
(Gain) loss on disposal of property, plant and equipment (11,000) 32,278
Non-cash rent expense 6,007 8,037
Changes in:    
Trade accounts receivable 992,399 (625,454)
Accrued interest income   495
Inventory (2,227,809) (574,456)
Prepaid expenses and other current assets (290,520) (169,234)
Other assets 1,548 (423)
Accounts payable and accrued expenses 19,349 (121,742)
Net cash (used for) provided by operating activities (246,049) 366,277
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of property, plant and equipment (2,485,095) (1,904,055)
Maturities of investments 996,000
Proceeds from sale of property, plant and equipment 11,000 13,975
Net cash used for investing activities (2,474,095) (894,080)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from public offering, net 4,233,026
Proceeds from debt issuance 2,000,000 400,000
Debt principal repayments (648,918) (573,366)
(Payments)/net adjustments of debt issuance costs (19,306) 2,272
Proceeds from exercise of stock options 30,672 11,693
Net cash provided by financing activities 1,362,448 4,073,625
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS (1,357,696) 3,545,822
BEGINNING CASH AND CASH EQUIVALENTS 10,185,468 6,949,937
ENDING CASH AND CASH EQUIVALENTS 8,827,772 10,495,759
CASH PAID FOR:    
Income taxes 4,575 5,135
Interest expense 247,303 234,324
NON-CASH ACTIVITIES:    
Change in capital expenditures included in accounts payable and accrued expenses (60,316) (48,533)
Surrender of shares to exercise stock options 165,337
Operating lease right-of-use asset and operating lease liability $ 1,184,727