Condensed Consolidated Statements of Cash Flows - USD ($)	6 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Operating activities:
Net income	$ 479,610	$ 635,819
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
(Recovery of) provision for doubtful accounts of accounts receivable	(35,764)	8,108
Depreciation of equipment and leasehold improvements	161,095	153,559
Stock-based compensation expense	262,785	309,756
Change in cash surrender value of life insurance	(168,756)	(158,521)
Provision for deferred compensation	167,560	58,000
Deferred compensation paid	(71,250)	(75,000)
Deferred compensation relieved	(472,883)
Other income - SBA loan forgiveness		(506,700)
Other income - Net gain from life insurance benefits	(255,975)
Net changes in operating assets and liabilities:
Accounts receivable	818,483	(234,090)
Inventories	(1,844,937)	(264,220)
Prepaid expenses and other current assets	(14,557)	(135,479)
Income taxes receivable		4,019
Income taxes payable	2,062
Accounts payable	467,762	282,535
Accrued liabilities	236,076	474,481
Deferred revenue	(112,025)	232,413
Net cash (used in) provided by operating activities	(380,714)	784,680
Investing activities:
Purchase of equipment and leasehold improvements	(75,155)	(374,558)
Life insurance premiums paid	(95,888)	(103,730)
Net cash (used in) investing activities	(171,043)	(478,288)
Financing activities:
Proceeds from exercise of stock options	1,390,346	88,918
Net cash provided by financing activities	1,390,346	88,918
Net increase in cash and cash equivalents	838,589	395,310
Cash and cash equivalents at beginning of period	6,950,215	3,999,409
Cash and cash equivalents at end of period	7,788,804	$ 4,394,719
Non-cash financing and investing activity:
Reclassification of cash surrender value of life insurance to life insurance receivable	$ 1,751,794