XML 65 R59.htm IDEA: XBRL DOCUMENT
v3.24.1.u1

Common Stock - Summary of Common Stock (Parenthetical) (Details) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2024 USD ($)
Related Party Transaction [Line Items] |
Cumulative Underwriting Fees and Commission and Offering Costs | $ 8,989
Fidus Investment Advisors LLC |
Related Party Transaction [Line Items] |
Cumulative Underwriting Fees and Commission and Offering Costs | $ 1,925

X
- Definition Cumulative underwriting fees and commission and offering costs. + References No definition available. + Details
Name: | fdus_CumulativeUnderwritingFeesAndCommissionAndOfferingCosts
Namespace Prefix: | fdus_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07(2)(c)(2)(i)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483575/946-220-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07(2)(c)(2)(ii)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483575/946-220-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07(2)(g)(3)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483575/946-220-S99-1 + Details
Name: | us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=fdus_FidusInvestmentAdvisorsLlcMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |