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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

X

- 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

X

- Details

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

X

- Details

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

X

- Details

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

X

- Details

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

X

- Details

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

X

- Details

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