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Statements of Cash Flows (Unaudited) - USD ($)
 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net loss $ (170,861) $ (300,190)
Adjustments to reconcile net loss to net cash provided by operating activities:    
Depreciation 1,241,455 1,232,222
Amortization of intangible assets 9,552 9,552
Amortization and write-off of debt issuance costs 3,820 3,920
Stock-based compensation 115,727 57,894
Gain on disposal of fixed assets (11,000) (10,000)
Non-cash rent expense 4,006 5,358
Changes in:    
Trade accounts receivable 1,280,525 (253,145)
Accrued interest income   495
Inventory (1,513,135) (328,348)
Prepaid expenses and other current assets 26,847 (39,512)
Other assets 2,332 782
Accounts payable and accrued expenses 22,725 (271,742)
Net cash provided by operating activities 1,011,993 107,286
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of property, plant and equipment (1,750,786) (1,228,655)
Maturities of investments   996,000
Proceeds from sale of fixed assets 11,000 10,000
Net cash used for investing activities (1,739,786) (222,655)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from public offering, net   4,233,026
Proceeds from debt issuance 2,000,000  
Debt principal repayments (425,816) (381,008)
Payments of debt issuance costs (19,306) 2,272
Proceeds from exercise of stock options 30,672 11,693
Net cash provided by financing activities 1,585,550 3,865,983
NET INCREASE IN CASH AND CASH EQUIVALENTS 857,757 3,750,614
BEGINNING CASH AND CASH EQUIVALENTS 10,185,468 6,949,937
ENDING CASH AND CASH EQUIVALENTS 11,043,225 10,700,551
CASH PAID FOR:    
Income taxes 4,575 5,125
Interest expense 159,396 157,418
NON-CASH ACTIVITIES:    
Change in capital expenditures included in accounts payable and accrued expenses $ (15,200) $ (74,439)