Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($)	Mar. 31, 2017	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)	24,324,576	23,573,057
Common stock, outstanding (in shares)	23,620,267	22,868,748
Series B Preferred Stock [Member]
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, authorized (in shares)	50,000	50,000
Preferred stock, issued (in shares)	200	200
Preferred stock, outstanding (in shares)	200	200
Preferred stock, liquidation preference	$ 31,500	$ 30,000
Series A Preferred Stock [Member]
Preferred stock, par value (in dollars per share)		$ 0.01
Preferred stock, authorized (in shares)		10,000
Preferred stock, issued (in shares)		0
Preferred stock, outstanding (in shares)		0
Series C Preferred Stock [Member]
Preferred stock, par value (in dollars per share)		$ 0.01
Preferred stock, authorized (in shares)		60,000
Preferred stock, issued (in shares)		0
Preferred stock, outstanding (in shares)		0