Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	6 Months Ended
	Dec. 31, 2019		Dec. 31, 2018
Operating activities:
Net (loss) income	$ (526,462)		$ 144,719	[1],[2],[3]
Adjustments to reconcile net income to net cash provided by operating activities:
(Recovery of) provision for doubtful accounts	(13,338)		30,806	[2]
Depreciation of equipment and leasehold improvements	189,138		248,830	[2]
Stock-based compensation expense	284,894		251,169	[2]
Deferred income taxes	11,650			[2]
Change in cash surrender value of life insurance	(145,605)		(24,744)	[2]
Change in deferred compensation accrual	37,016		87,977	[2]
Deferred compensation paid	(75,000)		(75,000)	[2]
Net changes in operating assets and liabilities:
Accounts receivable	1,200,714		1,669,262	[2]
Inventories	150,137		(1,046,995)	[2]
Prepaid expenses and other current assets	(100,724)		(59,861)	[2]
Income taxes receivable	(10,569)		25	[2]
Accounts payable	(607,099)		360,477	[2]
Accrued liabilities	111,312		(151,210)	[2]
Deferred revenue	(153,076)		(81,388)	[2]
Net cash provided by operating activities	352,988		1,354,067
Investing activities:
Purchase of equipment and leasehold improvements	(239,392)		(112,599)	[2]
Life insurance premiums paid	(112,794)		(122,915)	[2]
Net cash (used in) investing activities	(352,186)		(235,514)	[2]
Financing activities:
Proceeds from exercise of stock options			46,677	[2]
Net cash provided by financing activities			46,677	[2]
Net increase in cash and cash equivalents	802		1,165,230	[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	$ 2,229,084		$ 2,246,763	[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)