Condensed Statements of Cash Flows (Unaudited) - USD ($)	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
OPERATING ACTIVITIES
Net income	$ 985,374	$ 1,110,610
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	30,699	11,573
Deferred income taxes	25,000	56,000
Provision of credit losses	(8,236)	0
Stock issued for services to non-employee	0	2,700
Stock compensation expense	58,431	69,924
Accrued interest on short-term investments	(87,069)	(71,048)
Noncash operating lease expense, net	25,906	0
Changes in operating assets and liabilities:
Accounts receivable	945,876	(133,267)
Inventory	52,318	649,155
Prepaid expenses	141,335	(72,876)
Net investment in sales type leases	586	39,224
Accounts payable, accrued expenses	62,960	(13,061)
Customer deposits	(756,851)	156,751
Income tax receivable and payable	78,092	(115,782)
Net cash provided by operating activities	1,554,421	1,689,903
INVESTING ACTIVITIES
Capital expenditures	0	(79,655)
Purchase of short-term investment	0	(4,500,000)
Proceeds from short-term investments	2,570,085	1,500,000
Net cash provided by (used in) investing activities	2,570,085	(3,079,655)
FINANCING ACTIVITIES
Proceeds from exercise of employee stock options	7,860	0
Payment of dividends	(278,409)	(92,696)
Net cash used in financing activities	(270,549)	(92,696)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	3,853,957	(1,482,448)
CASH AND CASH EQUIVALENTS
Beginning of period	2,257,696	3,489,771
End of period	6,111,653	2,007,323
Supplemental cash flow information:
Cash paid for income taxes	229,908	464,300
Common Stock Issued out of Treasury Stock [Member]
Non-cash investing and financing activities:
Common stock issued out of treasury stock for settlement of accrued liabilities	13,960	0
Treasury Stock Issued to Employees [Member]
Non-cash investing and financing activities:
Common stock issued out of treasury stock for settlement of accrued liabilities	$ 0	$ 773