Note 9 - Concentrations (Details Textual) $ in Thousands	Mar. 31, 2021 USD ($)
Cash, FDIC Insured Amount	$ 250

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