Note 6 - Commitments and Contingent Liabilities (Details Textual)	3 Months Ended
Mar. 31, 2020
Real Estate Portfolio Segment [Member] \| Residential 1 to 4 Family [Member]
Financing Receivable, Percentage of Loans Delivered to Investors	100.00%
Standby Letters of Credit [Member]
Debt Instrument, Term (Year)	2 years

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

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