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Note 15 - Fair Value of Financial Instruments - Assets Measured at Fair Value on Non-recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Other Assets [Member] |  |
Financial assets measured at fair value | $ 228 | $ 280
Fair Value, Inputs, Level 1 [Member] | Other Assets [Member] |  |
Financial assets measured at fair value |  |
Fair Value, Inputs, Level 2 [Member] | Other Assets [Member] |  |
Financial assets measured at fair value |  |
Fair Value, Inputs, Level 3 [Member] | Other Assets [Member] |  |
Financial assets measured at fair value | 228 | 280
Impaired Loans [Member] |  |
Financial assets measured at fair value | 686 | 1,568
Impaired Loans [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Financial assets measured at fair value |  |
Impaired Loans [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Financial assets measured at fair value |  |
Impaired Loans [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Financial assets measured at fair value | 686 | 1,568
OREO [Member] |  |
Financial assets measured at fair value | 3,819 | 4,858
OREO [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Financial assets measured at fair value |  |
OREO [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Financial assets measured at fair value |  |
OREO [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Financial assets measured at fair value | $ 3,819 | $ 4,858

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a nonrecurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
Name: | us-gaap_AssetsFairValueDisclosureNonrecurring
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_BalanceSheetLocationAxis=us-gaap_OtherAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FairValueByAssetClassAxis=fusb_ImpairedLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FairValueByAssetClassAxis=fusb_OreoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |