Note 8 - Financial Instruments With Off-balance Sheet Risk (Details Textual)	6 Months Ended
Jun. 30, 2017
Home Equity Line of Credit [Member]
Line of Credit Facility, Expiration Period	10 years

Period remaining on line of credit facility before it terminates, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

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