CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	12 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
Operating activities:
Net loss	$ (874,831)	$ (950,911)
Adjustments to reconcile net loss to net cash used in operating activities:
Provision for (recovery of) credit losses	121	(4,105)
Depreciation of equipment and leasehold improvements	237,210	192,272
Net accretion of discount on treasury securities	(222,880)	(379,591)
Noncash operating lease expense	7,669	7,669
Stock-based compensation expense	31,782	155,834
Change in cash surrender value of life insurance	(215,012)	(197,363)
Provision for deferred compensation	133,330	96,004
Net changes in operating assets and liabilities:
Accounts receivable	72,526	175,303
Inventories	(411,387)	1,949,761
Prepaid expenses and other current assets	343,107	(78,923)
Interest receivable	49,251	(119,279)
Income taxes receivable	5,577	45,145
Income taxes payable	7,059	(51,338)
Accounts payable	489,501	62,316
Accrued liabilities	119,282	(1,020,193)
Deferred revenue	12,787	(73,132)
Net cash used in operating activities	(214,908)	(190,531)
Investing activities:
Purchase of equipment and leasehold improvements	(490,717)	(461,760)
Life insurance premiums paid	(70,577)	(81,744)
Proceeds from the maturity of treasury securities	14,303,000	14,331,000
Purchases of treasury securities	(13,861,990)	(13,985,921)
Net cash used in investing activities	(120,284)	(198,425)
Financing activities:
Proceeds from exercise of stock options	305,908	134,975
Net cash provided by financing activities	305,908	134,975
Net decrease in cash and cash equivalents	(29,284)	(253,981)
Cash and cash equivalents at beginning of year	2,837,081	3,091,062
Cash and cash equivalents at end of year	2,807,797	2,837,081
Supplemental cash flow information:
Cash paid (refunded) for income taxes	$ 4,847	$ (67,410)