Note 12 - Related Parties (Details Textual) - USD ($)	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Related Party Deposits and Repurchase Agreements	$ 19,400,000	$ 15,000,000.0
Directors and Executive Officers [Member]
Loan Commitments to Related Parties	122,000,000	115,000,000
Loans and Leases Receivable, Related Parties, Ending Balance	108,042,000	$ 104,043,000	$ 92,033,000
Directors [Member] \| SBA, CARES Act, Paycheck Protection Program [Member]
Loans and Leases Receivable, Related Parties, Ending Balance	$ 300,000

For an unclassified balance sheet, reflects the carrying amount of unpaid loan amounts due from related parties at the balance sheet date.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

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(e))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Name:	us-gaap_LoansAndLeasesReceivableRelatedParties
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant