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Note 16 - 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	Mar. 31, 2019 USD ($)
Impaired loans	$ 352
OREO	1,222
Assets held-for-sale	$ 198
Minimum [Member] | Measurement Input, Comparability Adjustment [Member]
Impaired loans, appraisal comparability adjustment	0.09
OREO, appraisal comparability adjustment	0.09
Assets held-for-sale	0.09
Maximum [Member] | Measurement Input, Comparability Adjustment [Member]
Impaired loans, appraisal comparability adjustment	0.1
OREO, appraisal comparability adjustment	0.1
Assets held-for-sale	0.1
Weighted Average [Member] | Measurement Input, Comparability Adjustment [Member]
Impaired loans, appraisal comparability adjustment	(0.095)
OREO, appraisal comparability adjustment	(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

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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_
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Balance Type:	na
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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

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

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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=117815213&loc=d3e19207-110258

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X

- Details

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