Consolidated Statements of Cash Flows - USD ($)		12 Months Ended
		Jun. 30, 2020	Jun. 30, 2019
Operating activities:
Net (loss) income		$ (465,597)	$ 305,989	[1],[2],[3]
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Provision for doubtful accounts		56,386	23,422	[1]
Depreciation of equipment and leasehold improvements		330,629	429,750	[1]
Stock-based compensation expense		549,594	515,681	[1]
Deferred income taxes		13,276	(13,276)	[1]
Change in cash surrender value of life insurance		(194,083)	(72,019)	[1]
Change in deferred compensation accrual		63,520	175,953	[1]
Deferred compensation paid		(150,000)	(150,000)	[1]
Net changes in operating assets and liabilities:
Accounts receivable		1,281,693	1,031,180	[1]
Inventories		1,312,654	(712,769)	[1]
Prepaid expenses and other current assets		(133,758)	72,887	[1]
Income taxes receivable		31,038	(13,285)	[1]
Accounts payable		(608,668)	6,882	[1]
Accrued liabilities		(70,414)	(138,448)	[1]
Deferred revenue		(214,568)	(50,882)	[1]
Net cash provided by operating activities		1,801,702	1,411,065	[1]
Investing activities:
Purchase of equipment and leasehold improvements		(424,159)	(187,756)	[1]
Life insurance premiums paid		(113,116)	(123,237)	[1]
Net cash (used in) investing activities		(537,275)	(310,993)	[1]
Financing activities:
Proceeds from SBA loan		506,700		[1]
Proceeds from exercise of stock options			46,677	[1]
Net cash provided by financing activities		506,700	46,677	[1]
Net increase in cash and cash equivalents		1,771,127	1,146,749	[1]
Cash and cash equivalents at beginning of year	[1]	2,228,282	1,081,533
Cash and cash equivalents at end of year		$ 3,999,409	$ 2,228,282	[1]

[1] As adjusted for change in accounting policy (Note 3)

[2] As adjusted for change in accounting policy (Note 3)

[3] As adjusted for change in accounting policy (Note 3)