CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	3 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Operating activities:
Net income (loss)	$ 243,729	$ (419,535)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation of equipment and leasehold improvements	67,427	53,133
Net amortization of discount on treasury securities	(63,594)	(75,821)
Amortization of finance lease right-of-use asset	2,643
Noncash operating lease expense	1,918	1,917
Stock-based compensation expense	1,474	14,264
Change in cash surrender value of life insurance	(193,324)	(165,291)
Provision for deferred compensation	160,884	197,374
Net changes in operating assets and liabilities:
Accounts receivable	172,215	(180,291)
Inventories	237,748	(261,430)
Prepaid expenses and other current assets	273,008	(80,096)
Interest receivable	16,814	55,814
Income taxes receivable	5,882	(2,529)
Income taxes payable	(9,870)	(7,674)
Accounts payable	(110,333)	401,865
Accrued liabilities	(65,759)	650,248
Deferred revenue	21,755	19,606
Net cash provided by operating activities	762,617	201,554
Investing activities:
Purchase of equipment and leasehold improvements	(1,100)	(357,193)
Life insurance premiums paid	(51,301)	(70,577)
Proceeds from the maturity of treasury securities		5,034,000
Purchases of treasury securities	(999,729)	(4,999,003)
Net cash used in investing activities	(1,052,130)	(392,773)
Financing activities:
Proceeds from exercise of stock options		104,870
Principal payments on finance lease obligations	(2,371)
Net cash (used in) provided by financing activities	(2,371)	104,870
Net decrease in cash and cash equivalents	(291,884)	(86,349)
Cash and cash equivalents at beginning of period	2,807,797	2,837,081
Cash and cash equivalents at end of period	2,515,913	2,750,732
Supplemental cash flow information:
Right of use assets obtained in exchange for finance lease liabilities	31,716
Cash paid for interest on finance lease liability	599
Acquisition of fixes asset through assumption of a liability	269,471
Cash paid, net of refunds, for income taxes	6,827	12,963
New York [Member]
Supplemental cash flow information:
Cash paid, net of refunds, for income taxes	2,022	1,550
Texas [Member]
Supplemental cash flow information:
Cash paid, net of refunds, for income taxes	2,000	6,500
Massachusetts [Member]
Supplemental cash flow information:
Cash paid, net of refunds, for income taxes	1,580	591
New Jersey [Member]
Supplemental cash flow information:
Cash paid, net of refunds, for income taxes	1,000	1,518
California [Member]
Supplemental cash flow information:
Cash paid, net of refunds, for income taxes		1,600
North Carolina [Member]
Supplemental cash flow information:
Cash paid, net of refunds, for income taxes		1,054
Other Tax Authority [Member]
Supplemental cash flow information:
Cash paid, net of refunds, for income taxes	$ 225	$ 150