Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($)	Dec. 31, 2016	Jun. 30, 2016
Common stock, par value (in dollars per share)	$ 0	$ 0
Common stock, authorized (in shares)	100,000,000	100,000,000
Common stock, issued (in shares)	23,784,363	23,573,057
Common stock, outstanding (in shares)	23,080,054	22,868,748
Series B Preferred Stock [Member]
Preferred stock, par value (in dollars per share)
Preferred stock, authorized (in shares)
Preferred stock, issued (in shares)
Preferred stock, outstanding (in shares)
Preferred stock, liquidation preference
Series A Preferred Stock [Member]
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, authorized (in shares)	10,000	10,000
Preferred stock, issued (in shares)	0	0
Preferred stock, outstanding (in shares)	0	0
Series C Preferred Stock [Member]
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, authorized (in shares)	60,000	60,000
Preferred stock, issued (in shares)	0	0
Preferred stock, outstanding (in shares)	0	0