Note 11 - Borrowings and Financing Activities FHLB Advances (Details)	6 Months Ended
Jun. 30, 2019
Debt Disclosure [Abstract]
Federal Home Loan Bank, Advances, Maturity Period, Fixed Rate	90 days

Maturity period on fixed rate advances made and reported by Federal Home Loan Bank (FHLBank), in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

Name:	us-gaap_FederalHomeLoanBankAdvancesMaturityPeriodFixedRate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration