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Note 1 - General (Details Textual) $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2016 USD ($)
December 31, 2015 [Member] | Reclassification from Other Liabilities to Surplus [Member] |
Prior Period Reclassification Adjustment | $ 0.7

X
- Definition The amount of a reclassification adjustment made to prior period financial statement amounts. + References No definition available. + Details
Name: | us-gaap_PriorPeriodReclassificationAdjustment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_CreationDateAxis=fusb_December312015Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AdjustmentsForNewAccountingPronouncementsAxis=fusb_ReclassificationFromOtherLiabilitiesToSurplusMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |