Note 2 - Significant Accounting Policies (Details Textual)	6 Months Ended
	Dec. 31, 2018
Minimum [Member]
Property, Plant and Equipment, Useful Life	3 years
Maximum [Member]
Property, Plant and Equipment, Useful Life	20 years
Centerpoint [Member]
Noncontrolling Interest, Ownership Percentage by Parent	58.90%