Note 3 - Property and Equipment, Net (Details Textual) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2019	Mar. 31, 2018	Jun. 30, 2018
Depreciation, Total	$ 69	$ 57	$ 57	$ 201	$ 189
Property, Plant and Equipment, Disposals				38	146
Property, Plant and Equipment, Net, Ending Balance	$ 1,802			1,802		$ 1,651
Gain (Loss) on Disposition of Property Plant Equipment, Total					5
Transportation Equipment [Member]
Property, Plant and Equipment, Disposals					4
Property, Plant and Equipment, Net, Ending Balance		$ 1			1
Gain (Loss) on Disposition of Property Plant Equipment, Total					3
Machinery and Equipment [Member]
Gain (Loss) on Disposition of Property Plant Equipment, Total					$ 2