Condensed Consolidated Statements of Cash Flows - USD ($)	6 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Operating activities:
Net income (loss)	$ 635,819	$ (526,462)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Provision for (recovery of) doubtful accounts	8,108	(13,338)
Depreciation of equipment and leasehold improvements	153,559	189,138
Stock-based compensation expense	309,756	284,894
Deferred income taxes		11,650
Change in cash surrender value of life insurance	(158,521)	(145,605)
Change in deferred compensation accrual	58,000	37,016
Deferred compensation paid	(75,000)	(75,000)
Other income - SBA loan forgiveness	(506,700)
Net changes in operating assets and liabilities:
Accounts receivable	(234,090)	1,200,714
Inventories	(264,220)	150,137
Prepaid expenses and other current assets	(135,479)	(100,724)
Income taxes receivable	4,019	(10,569)
Accounts payable	282,535	(607,099)
Accrued liabilities	474,481	111,312
Deferred revenue	232,413	(153,076)
Net cash provided by operating activities	784,680	352,988
Investing activities:
Purchase of equipment and leasehold improvements	(374,558)	(239,392)
Life insurance premiums paid	(103,730)	(112,794)
Net cash (used in) investing activities	(478,288)	(352,186)
Financing activities:
Proceeds from exercise of stock options	88,918
Net cash provided by financing activities	88,918
Net increase in cash and cash equivalents	395,310	802
Cash and cash equivalents at beginning of period	3,999,409	2,228,282
Cash and cash equivalents at end of period	$ 4,394,719	$ 2,229,084