Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Cash Flows from Operating Activities:
Net loss	$ (102,835)	$ (1,426,150)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities-
Depreciation and amortization	146,799	112,219
Provision for doubtful accounts receivable	2,933	1,497
Stock-based compensation expense	733,930	502,345
Non-cash consulting expense	0	45,000
Gain on forgiveness of bank note	(808,962)	0
Changes in operating assets and liabilities, net of effects of business acquisition-
Accounts receivable	(400,251)	682,173
Inventories	311,849	(462,640)
Prepaid expenses	(16,928)	46,629
Accounts payable	139,144	(108,258)
Customer advances	33,025	(33,133)
Accrued compensation and other	7,846	47,826
Net cash provided by (used in) operating activities	46,550	(592,492)
Cash Flows from Investing Activities:
Cash paid for business acquisition	(166,667)	(1,443,341)
Additional patent costs	(46,473)	(41,142)
Purchases of fixed assets	(75,924)	(119,150)
Net cash used in investing activities	(289,064)	(1,603,633)
Cash Flows from Financing Activities:
Payment of capital lease obligation	(58,804)	(40,241)
Gross proceeds from private placements of common stock	0	265,000
Gross proceeds from exercise of stock options	28,271	8,675
Proceeds from Paycheck Protection Program bank loan	0	808,962
Net cash (used in) provided by financing activities	(30,533)	1,042,396
Net decrease in cash and cash equivalents	(273,047)	(1,153,729)
Cash and cash equivalents, beginning of year	1,134,697	2,288,426
Cash and cash equivalents, end of year	861,650	1,134,697
Supplemental disclosure of cash flow information:
Cash paid during the year for income taxes	2,165	912
Supplemental disclosure of non-cash financing activities:
Issuance of common stock for services	0	45,000
Offering costs included in accrued liabilities	0	22,250
Acquisition of manufacturing equipment under capital lease	$ 161,976	$ 113,213