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Note 15 - Fair Value of Financial Instruments - Assets and Liabilities Measured at Fair Value Using Significant Unobservable Inputs (Level 3) (Details) - Fair Value, Inputs, Level 3 [Member] $ in Thousands	Jun. 30, 2018 USD ($)
Fair value	$ 691
Fair value	2,181
Assets held for sale	$ 198
Minimum [Member] | Measurement Input, Comparability Adjustment [Member]
Quantitative range of unobservable inputs	0.09
Quantitative range of unobservable inputs	0.09
Assets held for sale	0.09
Maximum [Member] | Measurement Input, Comparability Adjustment [Member]
Quantitative range of unobservable inputs	0.1
Quantitative range of unobservable inputs	0.1
Assets held for sale	0.1
Weighted Average [Member] | Measurement Input, Comparability Adjustment [Member]
Quantitative range of unobservable inputs	0.095
Quantitative range of unobservable inputs	0.095
Assets held for sale	0.095

X

- Definition

Fair value portion of impaired loans by an entity as a result of past transactions or events.

+ References

No definition available.

+ Details

Name:	fusb_ImpairedLoansFairValue
Namespace Prefix:	fusb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Value of input used to measure impaired loans.

+ References

No definition available.

+ Details

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Namespace Prefix:	fusb_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Value of input used to measure other assets.

+ References

No definition available.

+ Details

Name:	fusb_OtherAssetsMeasurementInput
Namespace Prefix:	fusb_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Fair value portion of other assets.

+ References

No definition available.

+ Details

Name:	us-gaap_OtherAssetsFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Carrying amount of other real estate not separately disclosed, including, but not limited to, real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations may also be included in real estate owned. This does not include real estate assets taken in settlement of troubled loans through surrender or foreclosure.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.10(4))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Value of input used to measure real estate owned by financial institution by financial institution which is not directly related to its business.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

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X

- Details

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- Details

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- Details

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- Details

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