v3.25.1
Statements of Cash Flows (Unaudited) - USD ($)
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Operating Activities    
     Net income (loss) $ 25,500 $ (1,028,200)
     Adjustments to reconcile net income (loss) to net cash provided by operating activities    
           Depreciation and amortization 1,700 14,200
           Stock-based compensation 23,600 912,000
           Amortization of operating lease right of use-building 19,300 13,200
           Inventory reserve (4,400) (38,300)
    (Increase) decrease in assets    
          Accounts receivable 55,200 139,200
          Inventory 30,200 116,000
          Interest receivable 0 (45,100)
          Prepaid and other current assets 61,600 21,200
          Long-term receivables 96,000 150,400
    Increase (decrease) in liabilities    
          Accounts payable 42,000 22,800
          Accrued expenses 40,000  
          Operating lease liability-current (21,000) (13,200)
Net cash provided by operating activities 369,700 264,200
Investing Activities    
Additions to fixed assets 0 (8,000)
Sale of short-term investments 0 1,074,700
Net cash provided by investing activities 0 1,066,700
Increase in cash and cash equivalents 369,700 1,330,900
Cash and Cash Equivalents    
     Beginning of period 10,839,700 2,269,200
     End of period $ 11,209,400 $ 3,600,100