CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Operating activities:
Net loss	$ (3,335,200)	$ (4,662,500)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	377,300	378,500
Stock-based compensation	530,200	1,187,300
Povision for bad debt	2,000	0
Loss on sale of investment securities	3,500	105,000
Unrealized holding (gain) on investment securities	(12,700)	(155,100)
Carrying value of right of use assets	167,400	136,000
Changes in operating assets and liabilities:
Trade accounts receivable	(57,800)	188,200
Inventories	88,800	(471,600)
Prepaid and other current assets	(31,200)	(77,100)
Income tax receivable	87,800	108,800
Accounts payable	500	(270,100)
Accrued expenses	(94,200)	137,900
Contract liabilities	5,100	(126,100)
Lease liabilities	(168,300)	(138,900)
Net cash used in operating activities	(2,436,800)	(3,659,700)
Investing activities:
Purchase of investment securities	(479,000)	(941,500)
Redemption of investment securities	2,121,900	3,420,300
Capital expenditures	(72,200)	(106,200)
Net cash provided by investing activities	1,570,700	2,372,600
Financing activities:
Proceeds from issuance of common stock	716,800	0
Issuance costs of common stock and warrants	(71,100)	0
Net cash provided by financing activities	645,700	0
Effect of changes in foreign currency exchange rates on cash and cash equivalents	(15,200)	4,500
Net decrease in cash and cash equivalents	(235,600)	(1,282,600)
Cash and cash equivalents, beginning of period	796,100	1,927,100
Cash and cash equivalents, end of period	$ 560,500	$ 644,500