Note 13 - Severance Costs (Details Textual) - USD ($) $ in Thousands	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019
Supplemental Unemployment Benefits, Severance Benefits	$ 105	$ 639	$ 726	$ 1,134

Liability for amount due employees, in addition to wages and any other money that employers owe employees, when their employment ends through a layoff or other termination. For example, a company may provide involuntarily terminated employees with a lump sum payment equal to one week's salary for every year of employment.

No definition available.

Name:	us-gaap_SupplementalUnemploymentBenefitsSeveranceBenefits
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant