Statements of Cash Flows (Unaudited) - USD ($)	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Cash flows from operating activities:
Net income	$ 2,747,151	$ 1,843,931
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	69,551	74,355
Net gain on marketable securities	(79,218)	(65,823)
Gain on sale of equipment	0	(10,000)
Allowance for (recovery of) credit losses	2,502	8,550
Change in allowance for obsolete inventory	(22,000)	37,000
Deferred income taxes	(51,263)	158,544
Decrease (increase) in operating assets:
Accounts receivable	70,170	(397,216)
Inventories	54,112	406,936
Prepaid expenses and other current assets	53,324	69,147
Prepaid income taxes	11,911	(208,408)
Increase (decrease) in operating liabilities:
Accounts payable	378,755	135,784
Accrued expenses and other current liabilities	(22,543)	(35,890)
Deferred revenue	(15,498)	0
Net cash provided by operating activities	3,196,954	2,016,910
us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract
Acquisition of property, plant, and equipment	(117,904)	(72,336)
Proceeds from sale of equipment	0	10,000
Proceeds from sale of marketable securities	1,065,000	5,255,145
Purchase of marketable securities	(7,188,933)	(464,653)
Net cash used in investing activities	(6,241,837)	4,728,156
us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract
Dividends paid	(2,756,323)	(459,387)
Net cash used in financing activities	(2,756,323)	(459,387)
Net (decrease) increase in cash and cash equivalents	(5,801,206)	6,285,679
Cash and cash equivalents at beginning of period	8,243,122	830,452
Cash and cash equivalents at end of period	2,441,916	7,116,131
Supplemental disclosure of cash flow information:
Taxes paid	825,795	525,000
Supplemental disclosure of non-cash items:
Dividends payable	$ 268	$ 45