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Note 1 - Basis of Presentation (Details Textual) | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2021 USD ($) $ / shares | Oct. 31, 2021 USD ($) | Jun. 30, 2021 € / shares | Dec. 31, 2020 € / shares
Common Stock, Par or Stated Value Per Share (in dollars per share) | € / shares |  |  | € 0.01 | € 0.01
Forecast [Member] | Mosing Holdings [Member] | Affiliated Entity [Member] |  |  |  |
Tax Receivable Agreement, Cash Payment for Settlement of Early Termination Payment Obligation | $ 15,000,000 |  |  |
Tax Receivable Agreement, Condition of Early Termination Payment Obligation Settlement, Period Over Which Future Contingent Payments May Be Made (Year) | 10 years |  |  |
Tax Receivable Agreement, Condition of Early Termination Payment Obligation Settlement, Future Contingent Payments, Cash Tax Savings Threshold | $ 18,057,000 |  |  |
Forecast [Member] | Merger with Expro [Member] |  |  |  |
Merger Exchange Ratio | 7.2720 |  |  |
Merger, Percentage of Post-merger Stock of Combined Company Owned By Reporting Entity Shareholders | 35.00% |  |  |
Merger, Percentage of Post-merger Stock of Combined Company Owned By the Other Entity's Shareholders | 65.00% |  |  |
Potential Termination of Merger Agreement Under Specified Circumstances, Potential Termination Fee Payable |  | $ 37,500,000 |  |
Potential Termination of Merger Agreement Under Specified Circumstances, Potential Termination Fee Receivable |  | $ 71,500,000 |  |
Expro [Member] | Forecast [Member] |  |  |  |
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares | $ 0.01 |  |  |

X
- Definition Represents the exchange ratio associated with a merger of the reporting entity with another entity. The exchange ratio is the number of shares of the reporting entity's common stock received by the shareholders of the other entity for each ordinary share of the other entity. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

X
- Definition Represents the percentage of the combined company, following the merger, owned by shareholders of the reporting entity. + References No definition available. + Details
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Namespace Prefix: | fi_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the percentage of the combined company, following the merger, owned by shareholders of the entity other than the reporting entity. + References No definition available. + Details
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Namespace Prefix: | fi_
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Balance Type: | na
Period Type: | instant

X
- Definition Fee to potentially be paid to the other party if the merger agreement is terminated by the reporting entity. + References No definition available. + Details
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X
- Definition Fee to potentially be received from the other party if the merger agreement is terminated by the other party. + References No definition available. + Details
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Namespace Prefix: | fi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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X
- Definition Represents the amount of cash payment for settlement of early termination payment obligation in connection with a tax receivable agreement. + References No definition available. + Details
Name: | fi_TaxReceivableAgreementCashPaymentForSettlementOfEarlyTerminationPaymentObligation
Namespace Prefix: | fi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the cash savings threshold which, if reached, will trigger future contingent payments to be made as a condition of the settlement of the early termination payment obligation in connection with a tax receivable agreement. + References No definition available. + Details
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Balance Type: | credit
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X
- Definition Represents the period of time over which future contingent payments might be made as a condition of the settlement of the early termination payment obligation in connection with a tax receivable agreement. + References No definition available. + Details
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Namespace Prefix: | fi_
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X
- Definition Face amount or stated value per share of common stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Details
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Namespace Prefix: |
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X
- Details
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X
- Details
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X
- Details
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X
- Details
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