CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Operating activities:
Net loss	$ (4,515,300)	$ (6,863,600)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	565,400	566,700
Stock-based compensation	849,700	2,033,000
Provision for bad debt	2,000	0
Loss on sale of investment securities	5,300	96,500
Unrealized holding gain on investment securities	(44,800)	(147,900)
Carrying value of right of use assets	249,000	201,400
Changes in operating assets and liabilities:
Trade accounts receivable	(192,600)	(20,100)
Inventories	156,800	(532,400)
Prepaid and other current assets	14,300	(162,100)
Income tax receivable	87,800	108,800
Accounts payable	(93,600)	175,400
Accrued expenses	(158,600)	39,700
Contract liabilities	20,700	(114,000)
Lease liabilities	(250,700)	(203,000)
Net cash used in operating activities	(3,304,600)	(4,821,600)
Investing activities:
Purchase of investment securities	(519,100)	(987,000)
Redemption of investment securities	3,025,000	4,505,400
Capital expenditures	(76,000)	(117,900)
Net cash provided by investing activities	2,429,900	3,400,500
Financing activities:
Proceeds from issuance of common stock	716,800	0
Issuance costs of common stock and warrants	(71,100)	0
Overdraft	0	13,300
Net cash provided by financing activities	645,700	13,300
Effect of changes in foreign currency exchange rates on cash and cash equivalents	(3,600)	(3,900)
Net decrease in cash and cash equivalents	(232,600)	(1,411,700)
Cash and cash equivalents, beginning of period	796,100	1,927,100
Cash and cash equivalents, end of period	$ 563,500	$ 515,400