Statements of Cash Flows (Unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Operating Activities
Net income (loss)	$ 30,300	$ (203,400)
Adjustments to reconcile net income (loss) to net cash provided by operating activities
Depreciation and amortization	8,300	8,500
Other assets	169,400	104,300
Other liabilities	(23,400)	(18,100)
Net income adjusted for non-cash operating activities	184,600	(108,700)
(Increase) decrease in assets
Accounts receivable	(163,700)	171,700
Inventory	81,000	(88,400)
Prepaid and other	(56,700)	79,100
Increase in liabilities
Accounts payable and accrued expenses	1,900	116,500
Income taxes	10,500	0
Total increase in operating capital	(127,000)	278,900
Net cash provided by operating activities	57,600	170,200
Investing Activities
Additions to fixed assets	(1,100)	0
Net cash used in investing activities	(1,100)	0
Increase in cash	56,500	170,200
Cash at beginning of year	5,337,800	1,846,700
Cash at end of period	$ 5,394,300	$ 2,016,900