Condensed Consolidated Statements of Cash Flows - USD ($)	9 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Operating activities:
Net loss	$ (642,135)	$ (840,542)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Provision for (recovery of) credit losses	121	(4,105)
Depreciation of equipment and leasehold improvements	172,356	142,046
Net accretion of (discount)/premium on treasury securities	(192,820)	(313,704)
Noncash operating lease expense	5,753	5,752
Stock-based compensation expense	25,689	119,937
Change in cash surrender value of life insurance	(173,807)	(156,644)
Provision for deferred compensation	148,680	113,387
Net changes in operating assets and liabilities:
Accounts receivable	156,243	186,567
Inventories	77,297	1,762,436
Prepaid expenses and other current assets	127,201	(114,762)
Interest receivable	23,443	(65,425)
Income taxes receivable	(375)	(123,877)
Income taxes payable	(1,558)	(81,956)
Accounts payable	143,417	(51,808)
Accrued liabilities	422,863	(440,742)
Deferred revenue	27,621	(153,118)
Net cash provided by (used in) operating activities	319,989	(16,558)
Investing activities:
Purchase of equipment and leasehold improvements	(483,767)	(460,960)
Life insurance premiums paid	(70,577)	(81,744)
Proceeds from the maturity of treasury securities	9,179,000	14,331,000
Purchases of treasury securities	(8,999,279)	(13,985,921)
Net cash used in investing activities	(374,623)	(197,625)
Financing activities:
Proceeds from exercise of stock options	152,445	35,800
Net cash provided by financing activities	152,445	35,800
Net increase (decrease) in cash and cash equivalents	97,811	(178,383)
Cash and cash equivalents at beginning of period	2,837,081	3,091,062
Cash and cash equivalents at end of period	2,934,892	2,912,679
Supplemental cash flow information:
Cash paid for income taxes	$ 13,364	$ 128,463