Condensed Consolidated Balance Sheets - USD ($)	Mar. 31, 2022	Jun. 30, 2021
Current assets:
Cash and cash equivalents	$ 9,487,935	$ 6,950,215
Accounts receivable, less allowance for doubtful accounts of $6,284 and $41,500, respectively	2,316,329	2,240,785
Inventories, net	7,750,800	5,901,512
Prepaid expenses and other current assets	460,949	456,004
Total current assets	20,016,013	15,548,516
Equipment and leasehold improvements, net	1,146,222	1,281,180
Other assets:
Operating lease right-of-use assets	2,089,896	2,305,455
Cash surrender value of life insurance	5,704,776	7,188,994
Total other assets	7,794,672	9,494,449
Total assets	28,956,907	26,324,145
Current liabilities:
Accounts payable	774,483	398,433
Accrued liabilities	806,544	665,567
Deferred revenue	595,984	694,632
Operating lease liability	298,291	288,949
Income taxes payable	4,380	4,543
Total current liabilities	2,479,682	2,052,124
Long-term liabilities:
Deferred compensation	2,284,909	2,491,482
Deferred revenue	170,440	188,932
Operating lease liability	1,791,605	2,016,506
Total long-term liabilities	4,246,954	4,696,920
Total liabilities	6,726,636	6,749,044
Stockholders' equity:
Common stock, $0.005 par value, authorized 20,000,000 shares; issued and outstanding 9,147,795 and 8,608,706, respectively	45,739	43,044
Paid in capital	12,571,779	10,802,118
Retained earnings	9,612,753	8,729,939
Total stockholders' equity	22,230,271	19,575,101
Total liabilities and stockholders' equity	$ 28,956,907	$ 26,324,145