Note 7 - Other Assets, Net - Other Assets, Net of Accumulated Amortization (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
Finite-Lived Intangible Assets, Gross	$ 988	$ 972
Less: Accumulated Amortization	(858)	(834)
Other assets, net	130	138
Amortization of Intangible Assets	37	38	$ 50
Computer Software, Intangible Asset [Member]
Finite-Lived Intangible Assets, Gross	90	90
Amortization of Intangible Assets	7	8	14
Licensing Agreements [Member]
Finite-Lived Intangible Assets, Gross	520	516
Amortization of Intangible Assets	14	14	18
Intellectual Property [Member]
Finite-Lived Intangible Assets, Gross	378	366
Amortization of Intangible Assets	$ 16	$ 16	$ 18