Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Operating activities:
Net income	$ 8,302,380	$ 1,268,409
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Provision for (recovery of) doubtful accounts receivable	4,000	(35,305)
Depreciation of equipment and leasehold improvements	230,292	293,465
Accretion of discount on treasury securities	(226,603)
Noncash operating lease expense	8,308
Stock-based compensation expense	289,676	463,633
Change in cash surrender value of life insurance	(187,329)	(211,636)
Provision (benefit) for deferred compensation	59,891	(160,120)
Deferred compensation gain		(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	463,103	429,470
Inventories	2,207,921	(2,729,850)
Prepaid expenses and other current assets	(96,144)	267,526
Interest receivable	(51,150)
Income taxes receivable	(83,816)
Income taxes payable	81,119	(1,510)
Accounts payable	(528,650)	397,730
Accrued liabilities	410,174	44,789
Deferred revenue	(149,786)	(170,463)
Net cash provided by (used in) operating activities	10,735,649	(942,530)
Investing activities:
Purchase of equipment and leasehold improvements	(98,441)	(108,158)
Life insurance premiums paid	(87,995)	(95,887)
Proceeds from life insurance policy		2,014,184
Proceeds from the maturity of treasury securities	2,022,000
Purchases of treasury securities	(18,859,671)
Net cash (used in) provided by investing activities	(17,024,107)	1,810,139
Financing activities:
Proceeds from exercise of stock options	171,350	1,390,346
Net cash provided by financing activities	171,350	1,390,346
Net (decrease) increase in cash and cash equivalents	(6,117,108)	2,257,955
Cash and cash equivalents at beginning of year	9,208,170	6,950,215
Cash and cash equivalents at end of year	3,091,062	$ 9,208,170
Supplemental cash flow information:
Cash paid for income taxes	$ 320,073