XML 72 R52.htm IDEA: XBRL DOCUMENT
v3.6.0.2

Note 2 - Summary of Significant Accounting Policies (Details Textual) |  | 12 Months Ended
--- | --- | ---
Feb. 22, 2017 shares | Dec. 31, 2016 shares | Dec. 31, 2015 shares
Number of Variable Interest Entity |  | 1 |
Maximum Maturity Period for Cash Equivalents |  | 90 days |
Number of Investment Portfolios |  | 3 |
Minimum Tax Benefit Likely of Being Realized Upon Ultimate Settlement With Tax Authority, Percentage |  | 50.00% |
Number of Reportable Segments |  | 2 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  | 97,000 | 96,150
Number of Securities Held as Trading Securities |  | 0 | 0
Non Qualified Stock Options [Member] | Subsequent Event [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | 64,600 |  |
Restricted Stock [Member] | Subsequent Event [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted | 7,533 |  |
Minimum [Member] |  |  |
Property, Plant and Equipment, Useful Life |  | 3 years |
Maximum [Member] |  |  |
Property, Plant and Equipment, Useful Life |  | 40 years |

X
- Definition Represents the maximum maturity period for cash equivalents. + References No definition available. + Details
Name: | fusb_MaximumMaturityPeriodForCashEquivalents
Namespace Prefix: | fusb_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the minimum tax benefit likely of being realized upon ultimate settlement with tax authority percentage. + References No definition available. + Details
Name: | fusb_MinimumTaxBenefitLikelyOfBeingRealizedUponUltimateSettlementWithTaxAuthorityPercentage
Namespace Prefix: | fusb_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of investment portfolios. + References No definition available. + Details
Name: | fusb_NumberOfInvestmentPortfolios
Namespace Prefix: | fusb_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of securities held as trading securities. + References No definition available. + Details
Name: | fusb_NumberOfSecuritiesHeldAsTradingSecurities
Namespace Prefix: | fusb_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of variable interest entity. + References No definition available. + Details
Name: | fusb_NumberOfVariableInterestEntity
Namespace Prefix: | fusb_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
Name: | us-gaap_NumberOfReportableSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Net number of non-option equity instruments granted to participants. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_AwardTypeAxis=fusb_NonQualifiedStockOptionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_RestrictedStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |