Statements of Cash Flows (Unaudited) - USD ($)	6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
Cash flows from operating activities:
Net income	$ 1,187,721	$ 1,881,667
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	50,184	47,831
Net gain on marketable securities	(36,926)	(31,995)
Allowance for credit losses	7,286	3,569
Change in allowance for obsolete inventory	(2,786)	(22,000)
Deferred income taxes	253,703	17,428
(Increase) decrease in operating assets:
Accounts receivable	(486,325)	(113,687)
Inventories	(77,036)	73,419
Prepaid expenses and other current assets	(26,028)	(29,042)
Prepaid income taxes	(193,643)	(37,581)
(Decrease) increase in operating liabilities:
Accounts payable	(9,395)	202,430
Accrued expenses	(170,064)	(8,291)
Deferred revenue	128,632	(15,498)
Net cash provided by operating activities	625,323	1,968,250
Cash flows from investing activities:
Acquisition of property, plant, and equipment	(21,221)	(87,304)
Proceeds from sale of marketable securities	7,301,264	775,000
Purchase of marketable securities	(6,394,357)	(1,345,229)
Net cash provided by (used in) investing activities	885,686	(657,533)
Cash flows from financing activities:
Dividends paid	(1,618,183)	(1,148,468)
Net cash used in financing activities	(1,618,183)	(1,148,468)
Net (decrease) increase in cash and cash equivalents	(107,174)	162,249
Cash and cash equivalents at beginning of period	1,875,655	8,243,122
Cash and cash equivalents at end of period	1,768,481	8,405,371
Supplemental disclosure of cash flow information
Taxes paid	250,780	575,795
Supplemental disclosure of non-cash items:
Dividends payable	$ 119	$ 112