Note 14 - Severance Costs - Accrued Severance Liability Activity (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Jun. 30, 2021
Balance	$ 13	$ 639	$ 639
Accrual of expense	0	0	41
Payments	(13)	(225)	(667)
Balance	$ 0	$ 414	$ 13

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