Condensed Consolidated Statements of Cash Flows - USD ($)	3 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Operating activities:
Net (loss) income	$ (257,609)	$ 9,944,743
Adjustments to reconcile net (loss) income to net cash (used in) provided by operating activities:
(Recovery of) Provision for doubtful accounts of accounts receivable	(4,105)	7,469
Depreciation of equipment and leasehold improvements	45,614	67,610
Accretion of discount on treasury securities	(120,305)
Noncash operating lease expense	1,917	2,556
Stock-based compensation expense	46,792	88,035
Change in cash surrender value of life insurance	(149,057)	(140,298)
(Benefit) Provision for deferred compensation	(59,935)	42,301
Net changes in operating assets and liabilities:
Accounts receivable	52,498	66,019
Inventories	644,569	732,866
Prepaid expenses and other current assets	(178,041)	(209,989)
Interest receivable	(5,243)
Income taxes receivable	(40,462)
Income taxes payable	(85,358)	597,941
Accounts payable	(38,968)	(274,746)
Accrued liabilities	(472,347)	954,343
Deferred revenue	(93,207)	(186,736)
Net cash (used in) provided by operating activities	(713,247)	11,692,114
Investing activities:
Purchase of equipment and leasehold improvements	(312,718)	(11,773)
Life insurance premiums paid	(81,744)	(87,994)
Proceeds from the maturity of treasury securities	2,000,000
Purchases of treasury securities	(1,999,074)
Net cash used in investing activities	(393,536)	(99,767)
Financing activities:
Proceeds from exercise of stock options		70,440
Net cash provided by financing activities		70,440
Net (decrease) increase in cash and cash equivalents	(1,106,783)	11,662,787
Cash and cash equivalents at beginning of period	3,091,062	9,208,170
Cash and cash equivalents at end of period	1,984,279	$ 20,870,957
Supplemental cash flow information:
Cash paid for income taxes	$ 127,700