v3.26.1
Statements of Cash Flows (Unaudited) - USD ($)
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Cash flows from operating activities:    
Net income $ 818,902 $ 560,895
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 29,008 25,030
Net gain on marketable securities (17,742) (12,350)
Allowance for credit losses 4,101 3,772
Change in allowance for obsolete inventory (5,000) (2,786)
Deferred income taxes 123,236 38,391
(Increase) decrease in operating assets:    
Accounts receivable (425,371) (127,396)
Inventories 192,093 (48,280)
Prepaid expenses and other current assets (4,347) (36,919)
Prepaid income taxes 91,000 (91,327)
(Decrease) increase in operating liabilities:    
Accounts payable (366,247) (46,753)
Accrued expenses and other current liabilities 151,439 59,803
Deferred revenue 13,464  
Net cash provided by operating activities 604,536 322,080
Cash flows from investing activities:    
Acquisition of property, plant, and equipment (9,886) (3,608)
Proceeds from sale of marketable securities 5,986,392 6,148,493
Purchase of marketable securities (5,946,393) (5,465,515)
Net cash provided by investing activities 30,113 679,370
Cash flows from financing activities:    
Dividends paid (1,149,892) (1,607,893)
Net cash used in financing activities (1,149,892) (1,607,893)
Net decrease in cash and cash equivalents (515,243) (606,443)
Cash and cash equivalents at beginning of period 1,251,097 1,875,655
Cash and cash equivalents at end of period 735,854 1,269,212
Supplemental disclosure of cash flow information    
Taxes paid   200,000
Supplemental disclosure of non-cash items:    
Dividends payable $ 44 $ 119