Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($)	Sep. 30, 2019	Jun. 30, 2019
Accounts receivable, allowance for doubtful accounts	$ 5,201	$ 2,617	[1]
Common stock, par value (in dollars per share)	$ 0.005	$ 0.005
Common stock, shares authorized (in shares)	20,000,000	20,000,000
Common stock, shares issued (in shares)	7,404,831	7,404,831
Common stock, shares outstanding (in shares)	7,404,831	7,404,831

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