Note 15 - Concentration of Cash Holdings (Details Textual) $ in Millions	Jun. 30, 2020 USD ($)
Cash, Uninsured Amount	$ 83

The amount of cash as of the balance sheet date that is not insured by the Federal Deposit Insurance Corporation.

No definition available.

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