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Note 8 - Premises and Equipment - Summary of Premises and Equipment and Applicable Depreciable Lives (Details) (Parentheticals) | 12 Months Ended
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Dec. 31, 2018
Minimum [Member] |
Useful lives for all premises and equipment (Year) | 3 years
Maximum [Member] |
Useful lives for all premises and equipment (Year) | 40 years
Building [Member] |
Useful lives for all premises and equipment (Year) | 40 years
Furniture and Fixtures [Member] | Minimum [Member] |
Useful lives for all premises and equipment (Year) | 3 years
Furniture and Fixtures [Member] | Maximum [Member] |
Useful lives for all premises and equipment (Year) | 7 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: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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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_PropertyPlantAndEquipmentByTypeAxis=us-gaap_FurnitureAndFixturesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |