Condensed Consolidated Statements of Cash Flows - USD ($)	6 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Operating activities:
Net income	$ 8,797,864	$ 479,610
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Provision for (recovery of) doubtful accounts of accounts receivable	8,473	(35,764)
Depreciation of equipment and leasehold improvements	135,915	161,095
Amortization of discount on treasury securities	(16,232)
Noncash operating lease expense	4,476
Stock-based compensation expense	166,708	262,785
Change in cash surrender value of life insurance	(143,691)	(168,756)
(Benefit) provision for deferred compensation	(46,075)	167,560
Deferred compensation paid		(71,250)
Deferred compensation relieved		(472,883)
Other income - Net gain from life insurance benefits		(255,975)
Net changes in operating assets and liabilities:
Accounts receivable	558,058	818,483
Inventories	801,766	(1,844,937)
Prepaid expenses and other current assets	(153,168)	(14,557)
Interest receivable	(128,030)
Income taxes payable	494,839	2,062
Accounts payable	(510,681)	467,762
Accrued liabilities	726,825	236,076
Deferred revenue	(158,464)	(112,025)
Net cash provided by (used in) operating activities	10,538,583	(380,714)
Investing activities:
Purchase of equipment and leasehold improvements	(50,492)	(75,155)
Life insurance premiums paid	(87,995)	(95,888)
Purchases of investments	(14,884,929)
Net cash (used in) investing activities	(15,023,416)	(171,043)
Financing activities:
Proceeds from exercise of stock options	88,940	1,390,346
Net cash provided by financing activities	88,940	1,390,346
Net (decrease) increase in cash and cash equivalents	(4,395,893)	838,589
Cash and cash equivalents at beginning of period	9,208,170	6,950,215
Cash and cash equivalents at end of period	$ 4,812,277	7,788,804
Non-cash financing and investing activity:
Reclassification of cash surrender value of life insurance to life insurance receivable		$ 1,751,794