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Note 5 - Acquisition Activity - Merger Expenses (Details) - Royal Financial, Inc. [Member] - USD ($) $ in Thousands | 6 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2022 | Sep. 30, 2022
Period merger expense | $ 2,900 | $ 2,852
Compensation and Benefits [Member] |  |
Period merger expense |  | 132
Data Processing [Member] |  |
Period merger expense |  | 1,929
Marketing [Member] |  |
Period merger expense |  | 135
Other [Member] |  |
Period merger expense |  | $ 656

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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479405/805-10-25-23 + Details
Name: | us-gaap_BusinessCombinationAcquisitionRelatedCosts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_BusinessAcquisitionAxis=fnwd_RoyalFinancialIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_IncomeStatementLocationAxis=fnwd_CompensationAndBenefitsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_IncomeStatementLocationAxis=fnwd_DataProcessingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_IncomeStatementLocationAxis=fnwd_MarketingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_IncomeStatementLocationAxis=fnwd_OtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |