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Note 10 - Fair Value Measurements - Summary of Financial Assets and Liabilities Measured At Fair Value On a Recurring Basis (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Investments: |  |
Cash surrender value of life insurance policies - deferred compensation plan | $ 27,261 | $ 26,167
Marketable securities - other | 2 | 3
Liabilities: |  |
Deferred compensation plan | 20,185 | 20,271
Fair Value, Inputs, Level 1 [Member] |  |
Investments: |  |
Cash surrender value of life insurance policies - deferred compensation plan | 0 | 0
Marketable securities - other | 2 | 3
Liabilities: |  |
Deferred compensation plan | 0 | 0
Fair Value, Inputs, Level 2 [Member] |  |
Investments: |  |
Cash surrender value of life insurance policies - deferred compensation plan | 27,261 | 26,167
Marketable securities - other | 0 | 0
Liabilities: |  |
Deferred compensation plan | 20,185 | 20,271
Fair Value, Inputs, Level 3 [Member] |  |
Investments: |  |
Cash surrender value of life insurance policies - deferred compensation plan | 0 | 0
Marketable securities - other | 0 | 0
Liabilities: |  |
Deferred compensation plan | $ 0 | $ 0

X
- Definition Of the fair value of financial obligations, this element represents the portion associated with deferred compensation plans. + References No definition available. + Details
Name: | fi_FinancialLiabilitiesFairValueDisclosureDeferredCompensationPlans
Namespace Prefix: | fi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Fair value portion of the amount that could be realized under a life insurance contract or contracts owned by the entity, commonly known as corporate-owned life insurance (COLI) or bank-owned life insurance (BOLI). + References No definition available. + Details
Name: | us-gaap_CashSurrenderValueFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_InvestmentsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_LiabilitiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of investment in marketable security. + 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 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
Name: | us-gaap_MarketableSecurities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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

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