Note 15 - Prior Period Financial Statement Revision - Effect of the Correction of the Immaterial Error on the Company's Statement of Comprehensive Loss (Details) - USD ($)	6 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2018	Jun. 30, 2017
Net loss	$ (2,770,000)	$ (40,940,000)	$ (29,095,000)
Other comprehensive loss:
Foreign currency translation adjustments	(5,000)	30,000	(1,000)
Comprehensive loss	(2,775,000)	(40,910,000)	(29,096,000)
Comprehensive loss attributable to non-controlling interests	(487,000)	(1,224,000)
Comprehensive loss attributable to common stockholders	(2,288,000)	$ (39,686,000)	$ (29,096,000)
Previously Reported [Member]
Net loss	(2,283,000)
Other comprehensive loss:
Foreign currency translation adjustments	(5,000)
Comprehensive loss	(2,288,000)
Comprehensive loss attributable to non-controlling interests	(487,000)
Comprehensive loss attributable to common stockholders	(1,801,000)
Restatement Adjustment [Member]
Net loss	(487,000)
Other comprehensive loss:
Foreign currency translation adjustments
Comprehensive loss	(487,000)
Comprehensive loss attributable to non-controlling interests
Comprehensive loss attributable to common stockholders	$ (487,000)