Condensed Consolidated Balance Sheets - USD ($)	Mar. 31, 2021	Jun. 30, 2020
Current assets:
Cash and cash equivalents	$ 6,028,952	$ 3,999,409
Accounts receivable, less allowance for doubtful accounts of $50,555 and $74,082, respectively	1,961,704	2,317,064
Inventories, net	6,857,171	5,538,794
Prepaid expenses and other current assets	480,129	267,647
Income taxes receivable	10,554	14,622
Total current assets	15,338,510	12,137,536
Equipment and leasehold improvements, net	1,307,307	983,641
Other assets:
Operating lease right-of-use assets	2,375,797	2,582,402
Cash surrender value of life insurance	7,150,681	6,876,827
Total other assets	9,526,478	9,459,229
Total assets	26,172,295	22,580,406
Current liabilities:
Accounts payable	950,303	827,705
Accrued liabilities	811,014	580,099
Deferred revenue	568,177	423,639
Operating lease liability	285,901	276,947
Short-term debt		506,700
Total current liabilities	2,615,395	2,615,090
Long-term liabilities:
Deferred compensation	2,393,982	2,333,482
Deferred revenue	175,784	170,281
Operating lease liability	2,089,896	2,305,455
Total long-term liabilities	4,659,662	4,809,218
Total liabilities	7,275,057	7,424,308
Stockholders' equity:
Common stock, $0.005 par value, authorized 20,000,000 shares; issued and outstanding 8,516,823 and 7,404,831, respectively	42,584	37,024
Paid in capital	10,456,658	6,882,729
Retained earnings	8,397,996	8,236,345
Total stockholders' equity	18,897,238	15,156,098
Total liabilities and stockholders' equity	$ 26,172,295	$ 22,580,406