Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Operating activities:
Net (loss) income	$ (950,911)	$ 8,319,212
Adjustments to reconcile net (loss) income to net cash (used in) provided by operating activities:
(Recovery of) Provision for doubtful accounts receivable	(4,105)	4,000
Depreciation of equipment and leasehold improvements	192,272	230,292
Accretion of discount on treasury securities	(379,591)	(226,603)
Noncash operating lease expense	7,669	8,308
Stock-based compensation expense	155,834	289,676
Change in cash surrender value of life insurance	(197,363)	(187,329)
Provision for deferred compensation	96,004	59,891
Loss on disposal of equipment and leasehold improvements		2,263
Net changes in operating assets and liabilities:
Accounts receivable	175,303	463,103
Inventories	1,949,761	2,207,921
Prepaid expenses and other current assets	(78,923)	(131,029)
Interest receivable	(119,279)	(51,150)
Income taxes receivable	45,145	(83,816)
Income taxes payable	(51,338)	81,119
Accounts payable	62,316	(528,650)
Accrued liabilities	(939,692)	428,227
Deferred revenue	(153,633)	(149,786)
Net cash (used in) provided by operating activities	(190,531)	10,735,649
Investing activities:
Purchase of equipment and leasehold improvements	(461,760)	(98,441)
Life insurance premiums paid	(81,744)	(87,995)
Proceeds from the maturity of treasury securities	14,331,000	2,022,000
Purchases of treasury securities	(13,985,921)	(18,859,671)
Net cash (used in) investing activities	(198,425)	(17,024,107)
Financing activities:
Proceeds from exercise of stock options	134,975	171,350
Net cash provided by financing activities	134,975	171,350
Net (decrease) in cash and cash equivalents	(253,981)	(6,117,108)
Cash and cash equivalents at beginning of year	3,091,062	9,208,170
Cash and cash equivalents at end of year	2,837,081	3,091,062
Supplemental cash flow information:
Cash (refunded) paid for income taxes	$ (67,410)	$ 320,073