Note 4 - Loans Receivable - PPP activity (Details) $ in Thousands	Sep. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)
Number of loans	146
Loans receivable, net of allowance for loan losses: September 30, 2020, $8,011 and December 31, 2019, $7,632	$ 1,065,892	$ 1,168,008
Paycheck Protection Program Loan Origination [Member]
Number of loans	315
Originated	$ 11,160
Paycheck Protection Program CARES Act [Member]
Number of loans	310
Loans receivable, net of allowance for loan losses: September 30, 2020, $8,011 and December 31, 2019, $7,632	$ 11,042

Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.7)
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant