Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - $ / shares	Sep. 30, 2018	Jun. 30, 2018
Preferred stock, par value (in dollars per share)	$ 0.10	$ 0.10
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	190,000,000	190,000,000
Common stock, shares issued (in shares)	7,383,706	7,249,370
Common stock, shares outstanding (in shares)	7,383,706	7,249,370
Series D Convertible Preferred Stock [Member]
Preferred stock, shares issued (in shares)	605,000	605,000
Preferred stock, shares outstanding (in shares)	605,000	605,000
Series E Convertible Preferred Stock [Member]
Preferred stock, par value (in dollars per share)	$ 30
Preferred stock, shares issued (in shares)	25,000	25,000
Preferred stock, shares outstanding (in shares)	25,000	25,000