Note 8 - Derivative Obligations (Details Textual) - USD ($)	6 Months Ended		12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Jun. 30, 2017	Jun. 30, 2016	Aug. 31, 2015	Jun. 30, 2015
Class of Warrant or Right, Outstanding	4,828,723		4,828,723	4,828,723		252,620
Derivative, Gain (Loss) on Derivative, Net	$ 133,000	$ (174,000)	$ (60,000)	$ 3,395,000
Series A Warrant [Member]
Class of Warrant or Right, Outstanding				404,412	404,412