Note 9 - Short-term Borrowings - Short-term Borrowings (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Short-Term Borrowings
Federal funds purchased	$ 3,800	$ 5,430
Short-term borrowings	$ 3,800	$ 5,430

Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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