Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	3 Months Ended
	Sep. 30, 2019		Sep. 30, 2018
Operating activities:
Net (loss) income	$ (310,749)		$ 41,570	[1],[2],[3]
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for doubtful accounts	2,584		42,938	[2]
Depreciation of equipment and leasehold improvements	94,357		125,748	[2]
Stock-based compensation expense	148,188		122,642	[2]
Deferred income taxes	3,319			[2]
Change in cash surrender value of life insurance	(144,872)		(24,449)	[2]
Change in deferred compensation accrual	37,016		43,988	[2]
Deferred compensation paid	(37,500)		(37,500)	[2]
Net changes in operating assets and liabilities:
Accounts receivable	520,401		1,079,739	[2]
Inventories	(7,331)		(258,008)	[2]
Prepaid expenses and other current assets	(97,147)		(115,685)	[2]
Income taxes receivable	(2,261)		25	[2]
Accounts payable	(864,195)		(296,892)	[2]
Accrued liabilities	61,102		96,777	[2]
Deferred revenue	(25,193)		(113,104)	[2]
Net cash (used in) provided by operating activities	(622,281)		707,789
Investing activities:
Purchase of equipment and leasehold improvements	(163,881)		(14,790)	[2]
Life insurance premiums paid	(112,633)		(122,754)	[2]
Net cash (used in) investing activities	(276,514)		(137,544)	[2]
Financing activities:
Proceeds from exercise of stock options			46,677	[2]
Net cash provided by financing activities			46,677	[2]
Net (decrease) increase in cash and cash equivalents	(898,795)		616,922	[2]
Cash and cash equivalents at beginning of period	2,228,282	[4]	1,081,533	[2]
Cash and cash equivalents at end of period	$ 1,329,487		$ 1,698,455	[2]

[1] As adjusted for change in accounting principle (Note 2)

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

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

[4] As adjusted for change in accounting principle (Note 2)