Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($)	Mar. 31, 2020	Jun. 30, 2019	[1]
Current assets:
Cash and cash equivalents	$ 2,063,963	$ 2,228,282
Accounts receivable, less allowance for doubtful accounts of $8,758 and $2,617, respectively	3,553,376	3,655,143
Inventories, net	4,991,561	6,851,448
Prepaid expenses and other current assets	388,501	133,889
Income taxes receivable	10,234	45,660
Total current assets	11,007,635	12,914,422
Equipment and leasehold improvements, net	1,022,860	890,110
Other assets:
Deferred income taxes		13,276
Operating lease right-of-use assets	2,649,823	2,847,846
Cash surrender value of life insurance	6,838,982	6,569,628
Total other assets	9,488,805	9,430,750
Total assets	21,519,300	23,235,282
Current liabilities:
Accounts payable	409,081	1,436,373
Accrued liabilities	634,897	650,513
Deferred revenue	439,302	645,470
Operating lease liability	274,025	265,443
Total current liabilities	1,757,305	2,997,799
Long-term liabilities:
Deferred compensation	2,344,478	2,419,962
Deferred revenue	165,226	163,018
Operating lease liability	2,375,797	2,582,402
Total long-term liabilities	4,885,501	5,165,382
Total liabilities	6,642,806	8,163,181
Stockholders' equity:
Common stock, $0.005 par value, authorized 20,000,000 shares; issued and outstanding 7,404,831	37,024	37,024
Paid in capital	6,761,363	6,333,135
Retained earnings	8,078,107	8,701,942
Total stockholders' equity	14,876,494	15,072,101
Total liabilities and stockholders' equity	$ 21,519,300	$ 23,235,282

[1] As adjusted for change in accounting principle (Note 2)