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Statements of Cash Flows (Unaudited) - USD ($)
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Cash flows from operating activities:    
Net income $ 1,881,667 $ 1,217,175
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 47,831 48,911
Net gain on marketable securities (31,995) (80,180)
Gain on sale of equipment 0 (10,000)
Allowance for (recovery of) credit losses 3,569 14,760
Change in allowance for obsolete inventory (22,000) 8,000
Deferred income taxes 17,428 150,453
(Increase) decrease in operating assets:    
Accounts receivable (113,687) (127,405)
Inventories 73,419 (115,014)
Prepaid expenses and other current assets (29,042) (23,713)
Prepaid income taxes (37,581) (210,758)
Increase (decrease) in operating liabilities:    
Accounts payable 202,430 125,427
Accrued expenses and other current liabilities (8,291) (145,409)
Deferred revenue (15,498) 0
Net cash provided by operating activities 1,968,250 852,247
us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract    
Acquisition of property, plant, and equipment (87,304) (3,912)
Proceeds from sale of equipment 0 10,000
Proceeds from sale of marketable securities 775,000 5,255,145
Purchase of marketable securities (1,345,229) (461,025)
Net cash used in investing activities (657,533) 4,800,208
Net cash (used in) provided by investing activities    
Dividends paid (1,148,468) 0
Net cash used in financing activities (1,148,468) 0
Net (decrease) increase in cash and cash equivalents 162,249 5,652,455
Cash and cash equivalents at beginning of period 8,243,122 830,452
Cash and cash equivalents at end of period 8,405,371 6,482,907
Supplemental disclosure of cash flow information:    
Taxes paid 575,795 375,000
Supplemental disclosure of non-cash items:    
Dividends payable $ 112 $ 0