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Statements of Cash Flows (Unaudited) - USD ($)
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income (loss) $ 513,287 $ (441,303)
Adjustments to reconcile net income (loss) to net cash provided by (used for) operating activities:    
Depreciation 616,847 614,695
Amortization of intangible assets 4,776 4,776
Amortization and write-off of debt issuance costs 1,905 1,960
Stock-based compensation 54,093 34,629
Gain on disposal of fixed assets (11,000) (10,000)
Non-cash rent expense 4,079 2,679
Changes in:    
Trade accounts receivable 41,638 (593,404)
Accrued interest income   495
Inventory (345,860) (29,936)
Prepaid expenses and other current assets (98,343) (169,271)
Other assets 3,116 2,787
Accounts payable and accrued expenses (146,003) (41,653)
Net cash provided by (used for) operating activities 638,535 (623,546)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of property, plant and equipment (807,496) (349,316)
Maturities of investments   996,000
Proceeds from sale of fixed assets 11,000 10,000
Net cash (used for) provided by investing activities (796,496) 656,684
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from debt issuance 2,000,000  
Debt principal repayments (197,385) (190,377)
Payments of debt issuance costs (18,826) 2,272
Proceeds from exercise of stock options 5,840 11,680
Net cash provided by (used for) financing activities 1,789,629 (176,425)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 1,631,668 (143,287)
BEGINNING CASH AND CASH EQUIVALENTS 10,185,468 6,949,937
ENDING CASH AND CASH EQUIVALENTS 11,817,136 6,806,650
CASH PAID FOR:    
Income taxes 5,535  
Interest expense 71,877 78,766
NON-CASH ACTIVITIES:    
Change in capital expenditures included in accounts payable and accrued expenses $ (47,900) $ (80,213)