Condensed Consolidated Balance Sheets - USD ($)	Dec. 31, 2020	Jun. 30, 2020
Current assets:
Cash and cash equivalents	$ 4,394,719	$ 3,999,409
Accounts receivable, less allowance for doubtful accounts of $61,099 and $74,082, respectively	2,543,046	2,317,064
Inventories, net	5,803,014	5,538,794
Prepaid expenses and other current assets	403,126	267,647
Income taxes receivable	10,603	14,622
Total current assets	13,154,508	12,137,536
Equipment and leasehold improvements, net	1,204,641	983,641
Other assets:
Operating lease right-of-use assets	2,445,397	2,582,402
Cash surrender value of life insurance	7,139,078	6,876,827
Total other assets	9,584,475	9,459,229
Total assets	23,943,624	22,580,406
Current liabilities:
Accounts payable	1,110,240	827,705
Accrued liabilities	1,054,580	580,099
Deferred revenue	641,215	423,639
Operating lease liability	282,885	276,947
Short-term debt		506,700
Total current liabilities	3,088,920	2,615,090
Long-term liabilities:
Deferred compensation	2,316,482	2,333,482
Deferred revenue	185,118	170,281
Operating lease liability	2,162,513	2,305,455
Total long-term liabilities	4,664,113	4,809,218
Total liabilities	7,753,033	7,424,308
Stockholders' equity:
Common stock, $0.005 par value, authorized 20,000,000 shares; issued and outstanding 7,447,489 and 7,404,831, respectively	37,237	37,024
Paid in capital	7,281,190	6,882,729
Retained earnings	8,872,164	8,236,345
Total stockholders' equity	16,190,591	15,156,098
Total liabilities and stockholders' equity	$ 23,943,624	$ 22,580,406