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Note 5 - Premises and Equipment - Components of Premises and Equipment (Details) (Parentheticals) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Building [Member] | Minimum [Member] |  |
Useful lives (Year) | 15 years | 15 years
Building [Member] | Maximum [Member] |  |
Useful lives (Year) | 50 years | 50 years
Furniture and Fixtures [Member] | Minimum [Member] |  |
Useful lives (Year) | 3 years | 3 years
Furniture and Fixtures [Member] | Maximum [Member] |  |
Useful lives (Year) | 10 years | 10 years

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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_BuildingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_FurnitureAndFixturesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |