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Statements of Cash Flows - USD ($)
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Net income $ 2,105,738 $ 3,250,875
Depreciation and amortization 108,200 95,885
Net gain on marketable securities (34,359) (26,989)
Allowance for credit losses 2,827 (2,330)
Change in allowance for obsolete inventory (792) (14,208)
Deferred income taxes 382,643 (124,467)
Accounts receivable 161,261 (140,714)
Inventories (54,976) (214,281)
Prepaid expenses and other current assets (35) (16,096)
Prepaid income taxes (146,146) (2,797)
us-gaap_IncreaseDecreaseInAccountsPayable 55,788 290,554
Accrued expenses (302,985) 104,889
Deferred revenue 12,177 (15,498)
Net cash provided by operating activities 1,966,819 3,466,251
Cash flows from investing activities:    
Acquisition of property, plant, and equipment (58,995) (433,077)
Proceeds from sale of marketable securities (12,941,872) (8,459,318)
Purchase of marketable securities 13,176,210 1,815,000
Net cash provided by (used in) investing activities 175,343 (7,077,395)
Cash flows from financing activities:    
Dividends paid (2,766,720) (2,756,323)
Net cash used in financing activities (2,766,720) (2,756,323)
Net (decrease) increase in cash and cash equivalents (624,558) (6,367,467)
Cash and cash equivalents at beginning of period 1,875,655 8,243,122
Cash and cash equivalents at end of period 1,251,097 1,875,655
Supplemental disclosure of cash flow information    
Taxes paid 300,780 1,050,795
Supplemental disclosure of non-cash items:    
Dividends payable $ 163 $ 268