Condensed Consolidated Statements of Cash Flows - USD ($)	6 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Operating activities:
Net loss	$ (325,393)	$ (526,762)
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	113,858	93,647
Accretion of discount on treasury securities	(152,879)	(234,298)
Noncash operating lease expense	3,834	3,835
Stock-based compensation expense	19,664	84,040
Change in cash surrender value of life insurance	(169,596)	(152,892)
Provision for deferred compensation	134,665	63,255
Net changes in operating assets and liabilities:
Accounts receivable	(161,873)	(130,286)
Inventories	(96,941)	1,256,774
Prepaid expenses and other current assets	139,243	(59,750)
Interest receivable	71,923	(82,896)
Income taxes receivable	(375)	(40,462)
Income taxes payable	(7,068)	(83,479)
Accounts payable	(73,686)	(5,011)
Accrued liabilities	395,342	(418,796)
Deferred revenue	58,742	(107,999)
Net cash used in operating activities	(50,419)	(345,185)
Investing activities:
Purchase of equipment and leasehold improvements	(419,553)	(401,594)
Life insurance premiums paid	(70,577)	(81,744)
Proceeds from the maturity of treasury securities	7,085,000	7,223,000
Purchases of treasury securities	(6,998,250)	(6,997,085)
Net cash used in investing activities	(403,380)	(257,423)
Financing activities:
Proceeds from exercise of stock options	152,445	35,800
Net cash provided by financing activities	152,445	35,800
Net (decrease) in cash and cash equivalents	(301,354)	(566,808)
Cash and cash equivalents at beginning of period	2,837,081	3,091,062
Cash and cash equivalents at end of period	2,535,727	2,524,254
Supplemental cash flow information:
Cash paid for income taxes	$ 12,963	$ 127,700