Note 7 - Other Assets, Net - Other Assets, Net of Accumulated Amortization (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Finite-Lived Intangible Assets, Gross	$ 972	$ 972
Less: Accumulated Amortization	(834)	(810)
Other assets, net	138	162
Amortization of Intangible Assets	38	50	$ 50
Computer Software, Intangible Asset [Member]
Finite-Lived Intangible Assets, Gross	90	90
Amortization of Intangible Assets	8	14	14
Licensing Agreements [Member]
Finite-Lived Intangible Assets, Gross	516	516
Amortization of Intangible Assets	14	18	18
Intellectual Property [Member]
Finite-Lived Intangible Assets, Gross	366	366
Amortization of Intangible Assets	$ 16	$ 18	$ 18