Condensed Consolidated Statements of Cash Flows - USD ($)	9 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Operating activities:
Net income	$ 8,565,011	$ 882,814
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Provision for (recovery of) doubtful accounts of accounts receivable	40,277	(35,216)
Depreciation of equipment and leasehold improvements	186,168	225,130
Amortization of discount on treasury securities	(110,632)
Noncash operating lease expense	6,391
Stock-based compensation expense	243,688	382,010
Change in cash surrender value of life insurance	(147,012)	(171,688)
Provision for deferred compensation	62,783	187,560
Deferred compensation paid		(71,250)
Deferred compensation relieved		(472,883)
Other income - Net gain from life insurance benefits		(262,391)
Loss on disposal of fixed assets	2,263	7,856
Net changes in operating assets and liabilities:
Accounts receivable	570,932	(40,328)
Inventories	1,552,103	(1,849,288)
Prepaid expenses and other current assets	(205,710)	(4,945)
Interest receivable	(56,014)
Income taxes payable	247,170	(163)
Accounts payable	(442,850)	376,050
Accrued liabilities	310,466	290,977
Deferred revenue	(208,308)	(117,140)
Net cash provided by (used in) operating activities	10,616,726	(672,895)
Investing activities:
Purchase of equipment and leasehold improvements	(68,242)	(98,028)
Life insurance premiums paid	(87,994)	(95,887)
Proceeds from life insurance policy		2,014,184
Purchases of investments	(16,884,358)
Net cash (used in) provided by investing activities	(17,040,594)	1,820,269
Financing activities:
Proceeds from exercise of stock options	137,330	1,390,346
Net cash provided by financing activities	137,330	1,390,346
Net (decrease) increase in cash and cash equivalents	(6,286,538)	2,537,720
Cash and cash equivalents at beginning of period	9,208,170	6,950,215
Cash and cash equivalents at end of period	2,921,632	$ 9,487,935
Supplemental cash flow information:
Cash paid for income taxes	$ 216,759