Condensed Consolidated Statements of Cash Flows - USD ($)	9 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Operating activities:
Net income (loss)	$ 161,651	$ (623,835)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Recovery of doubtful accounts	(171)	(8,938)
Depreciation of equipment and leasehold improvements	222,998	258,401
Stock-based compensation expense	464,032	428,228
Deferred income taxes		13,276
Change in cash surrender value of life insurance	(169,963)	(156,398)
Change in deferred compensation accrual	173,000	37,016
Deferred compensation paid	(112,500)	(112,500)
Other income - SBA loan forgiveness	(506,700)
Net changes in operating assets and liabilities:
Accounts receivable	355,531	110,705
Inventories	(1,318,377)	1,859,887
Prepaid expenses and other current assets	(212,482)	(254,612)
Income taxes receivable	4,068	35,426
Accounts payable	122,598	(1,027,292)
Accrued liabilities	230,915	(15,616)
Deferred revenue	150,041	(203,960)
Net cash (used in) provided by operating activities	(435,359)	339,788
Investing activities:
Purchase of equipment and leasehold improvements	(546,664)	(391,151)
Life insurance premiums paid	(103,891)	(112,956)
Net cash (used in) investing activities	(650,555)	(504,107)
Financing activities:
Proceeds from exercise of stock options	3,115,457
Net cash provided by financing activities	3,115,457
Net increase (decrease) in cash and cash equivalents	2,029,543	(164,319)
Cash and cash equivalents at beginning of period	3,999,409	2,228,282
Cash and cash equivalents at end of period	$ 6,028,952	$ 2,063,963