Condensed Consolidated Statements of Cash Flows - USD ($)	3 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Operating activities:
Net income (loss)	$ 126,928	$ (310,749)
Adjustments to reconcile net income (loss) to net cash (used in) operating activities:
Provision for doubtful accounts	10,698	2,584
Depreciation of equipment and leasehold improvements	74,278	94,357
Stock-based compensation expense	152,994	148,188
Deferred income taxes		3,319
Change in cash surrender value of life insurance	(157,285)	(144,872)
Change in deferred compensation accrual	21,000	37,016
Deferred compensation paid	(37,500)	(37,500)
Net changes in operating assets and liabilities:
Accounts receivable	(922,662)	520,401
Inventories	241,541	(7,331)
Prepaid expenses and other current assets	(200,115)	(97,147)
Income taxes receivable	1,479	(2,261)
Accounts payable	111,250	(864,195)
Accrued liabilities	269,335	61,102
Deferred revenue	127,159	(25,193)
Net cash (used in) operating activities	(180,900)	(622,281)
Investing activities:
Purchase of equipment and leasehold improvements	(264,996)	(163,881)
Life insurance premiums paid	(103,568)	(112,633)
Net cash (used in) investing activities	(368,564)	(276,514)
Financing activities:
Net (decrease) in cash and cash equivalents	(549,464)	(898,795)
Cash and cash equivalents at beginning of period	3,999,409	2,228,282
Cash and cash equivalents at end of period	$ 3,449,945	$ 1,329,487