Note 10 - Business Risk and Credit Risk Concentration Involving Cash (Details Textual) $ in Thousands	3 Months Ended	9 Months Ended
Mar. 31, 2022 USD ($)	Mar. 31, 2022 USD ($)
Cash, FDIC Insured Amount	$ 250	$ 250
Customer Concentration Risk [Member] \| Revenue Benchmark [Member]
Number Of Customers	2	3

The amount of cash deposited in financial institutions as of the balance sheet date that is insured by the Federal Deposit Insurance Corporation.

No definition available.

Name:	us-gaap_CashFDICInsuredAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant