Statements of Cash Flows (unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Operating Activities
Net income (loss)	$ (1,028,200)	$ 30,300
Adjustments to reconcile net income (loss) to net cash provided by operating activities
Depreciation and amortization	14,200	8,300
Stock-based compensation	912,000
Interest income accrued	(45,100)
(Increase) decrease in assets
Accounts receivable	139,200	(163,700)
Inventory	77,700	81,000
Prepaid and other	21,200	(56,700)
Long-term receivables	150,400	169,400
Increase (decrease) in liabilities
Accounts payable and accrued expenses	22,800	(21,500)
Income taxes		10,500
Net cash provided by operating activities	264,200	57,600
Investing Activities
Additions to fixed assets	(8,000)	(1,100)
Sale of short-term investments	1,074,700
Net cash provided by (used in) investing activities	1,066,700	(1,100)
Increase in cash and cash equivalents	1,330,900	56,500
Cash and Cash Equivalents
Beginning of year	2,269,200	5,337,800
End of period	$ 3,600,100	$ 5,394,300