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Note 15 - Commitments and Contingencies - Financial Instruments Outstanding Whose Contract Amount Represents Credit Risk (Details) - USD ($) | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Standby Letters of Credit | $ 1,536,000 | $ 1,551,000
Loan Origination Commitments [Member] |  |
Commitments to Extend Credit | $ 96,374,000 | $ 71,359,000

X
- Definition Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments. + References No definition available. + Details
Name: | us-gaap_ContractualObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_LoanOriginationCommitmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |