Note 2 - Summary of Significant Accounting Policies - Calculation for Basic and Diluted Earnings Per Share (Details) - shares		6 Months Ended	12 Months Ended
		Dec. 31, 2017	Jun. 30, 2017	Jun. 30, 2016
Anti-dilutive securities (in shares)		5,985,166	5,285,805	8,673,138
Convertible Debt Securities [Member]
Anti-dilutive securities (in shares)				3,676,471
Vested Series A Warrants [Member]
Anti-dilutive securities (in shares)		404,412	404,412	404,412
Unvested Series A Warrants [Member]
Anti-dilutive securities (in shares)	[1]	698,529	698,529	698,529
Warrant, Other [Member]
Anti-dilutive securities (in shares)		3,725,782	3,725,782	3,725,782
Employee Stock Option [Member]
Anti-dilutive securities (in shares)		1,156,027	397,388	104,378
Restricted Stock Units (RSUs) [Member]
Anti-dilutive securities (in shares)		416	59,694	63,566

[1] The unvested Series A warrants were subject to vesting based upon the amount of funds actually received by the Company in the second close of the August 2015 financing which never occurred. The warrants will remain outstanding but unvested until they expire in February 2021.