XML 64 R58.htm IDEA: XBRL DOCUMENT
v3.25.3

Commitments and Contingencies - Summary of Outstanding Commitments (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Loss Contingencies [Line Items] |  |
Total Commitment | $ 35,143 | $ 17,117
Unfunded Commitment | 31,868 | 12,363
Acendre Midco, Inc. - Revolving Loan |  |
Loss Contingencies [Line Items] |  |
Total Commitment | 1,000 | 1,000
Ad Info Parent, Inc. (dba MediaRadar) - Revolving Loan |  |
Loss Contingencies [Line Items] |  |
Total Commitment | 1,442 | 1,442
Unfunded Commitment | 1,442 | 865
Axis Medical Technologies LLC (dba MoveMedical) - Revolving Loan |  |
Loss Contingencies [Line Items] |  |
Total Commitment | 800 | 800
Unfunded Commitment | 800 | 800
Choice Technology Solutions, LLC (dba Choice Merchant Solutions, LLC) - Revolving Loan |  |
Loss Contingencies [Line Items] |  |
Total Commitment |  | 1,000
Unfunded Commitment |  | 1,000
Detechtion Holdings, LLC - First Lien Debt |  |
Loss Contingencies [Line Items] |  |
Total Commitment | 1,250 |
Unfunded Commitment | 1,250 |
Detechtion Holdings, LLC - Revolving Loan |  |
Loss Contingencies [Line Items] |  |
Total Commitment | 1,000 | 1,000
Unfunded Commitment | 1,000 | 1,000
Elements Brands, LLC - Revolving Loan |  |
Loss Contingencies [Line Items] |  |
Total Commitment |  | 1,500
Enterprise Asset Management FM Purchaser, Inc. (dba MCIM) - First Lien Debt |  |
Loss Contingencies [Line Items] |  |
Total Commitment | 3,000 |
Unfunded Commitment | 3,000 |
Fraser Steel LLC - Revolving Loan |  |
Loss Contingencies [Line Items] |  |
Total Commitment | 2,000 |
Unfunded Commitment | 2,000 |
Fishbowl Solutions, LLC - Revolving Loan |  |
Loss Contingencies [Line Items] |  |
Total Commitment | 3,000 | 3,000
Unfunded Commitment | 3,000 | 2,223
GMP HVAC, LLC (dba McGee Heating & Air, LLC) - Revolving Loan |  |
Loss Contingencies [Line Items] |  |
Total Commitment |  | 1,500
Unfunded Commitment |  | 1,500
Laboratory Testing, LLC - Revolving Loan |  |
Loss Contingencies [Line Items] |  |
Total Commitment | 4,000 |
Unfunded Commitment | 3,427 |
Mayesh Wholesale Florist, LLC - First Lien Debt |  |
Loss Contingencies [Line Items] |  |
Total Commitment | 2,000 |
Unfunded Commitment | 2,000 |
NWS Technologies, LLC - First Lien Debt |  |
Loss Contingencies [Line Items] |  |
Total Commitment | 1,900 |
Unfunded Commitment | 1,259 |
PayEntry Financial Services, Inc. (dba Payentry) - Second Lien (DDTL B) |  |
Loss Contingencies [Line Items] |  |
Total Commitment | 1,563 |
Unfunded Commitment | 1,563 |
PayEntry Financial Services, Inc. (dba Payentry) - Second Lien (DDTL B) |  |
Loss Contingencies [Line Items] |  |
Total Commitment | 1,563 |
Unfunded Commitment | 1,563 |
Pronto Plumbing & Drain, Inc. - Revolving Loan |  |
Loss Contingencies [Line Items] |  |
Total Commitment | 500 |
Unfunded Commitment | 500 |
Tedia Company, LLC - Revolving Loan |  |
Loss Contingencies [Line Items] |  |
Total Commitment | 2,250 | 2,250
Unfunded Commitment | 2,250 | 2,250
Thrust Flight LLC - First Lien Debt |  |
Loss Contingencies [Line Items] |  |
Total Commitment | 3,500 | 2,625
Unfunded Commitment | 3,339 | 2,625
True Environmental Inc. - First Lien Debt |  |
Loss Contingencies [Line Items] |  |
Total Commitment | 3,375 |
Unfunded Commitment | 3,375 |
W50 Holdings, LLC - Preferred Equity |  |
Loss Contingencies [Line Items] |  |
Total Commitment | 1,000 | 1,000
Unfunded Commitment | $ 100 | $ 100

X
- Definition Commitments outstanding to fund various undrawn revolving loans, other debt investments and capital commitments. + References No definition available. + Details
Name: | fdus_CommitmentsOutstandingToFundVariousUndrawnRevolvingLoansOtherDebtInvestmentsAndCapitalCommitments
Namespace Prefix: | fdus_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of contractual obligation, including, but not limited to, long-term debt, lease obligation, purchase obligation, and other commitments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 942 -SubTopic 235 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477314/942-235-S99-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480738/235-10-S50-4 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-3 + Details
Name: | us-gaap_ContractualObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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 275 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482861/275-10-50-9 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 450 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483076/450-20-50-4 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 450 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483076/450-20-50-9 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 720 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483359/720-20-50-1 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Topic 460 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 27 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482395/460-10-55-27 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 450 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483076/450-20-50-9 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 450 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483076/450-20-50-4 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 460 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482425/460-10-50-3 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 450 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483076/450-20-50-1 + Details
Name: | us-gaap_LossContingenciesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_InvestmentTypeAxis=fdus_AcendreMidcoIncRevolvingLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=fdus_AdInfoParentIncDbaMediaradarRevolvingLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=fdus_AxisMedicalTechnologiesLLCDbaMoveMedicalRevolvingLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=fdus_ChoiceTechnologySolutionsLlcDbaChoiceMerchantSolutionsLlcRevolvingLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=fdus_DetechtionHoldingsLLCFirstLienDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=fdus_DetechtionHoldingsLlcRevolvingLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=fdus_ElementsBrandsLlcRevolvingLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=fdus_EnterpriseAssetManagementFmPurchaserIncDbaMcim-FirstLienDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=fdus_FraserSteelLLCRevolvingLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=fdus_FishbowlSolutionsLLCRevolvingLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=fdus_GmpHvacLlcDbaMcgeeHeatingAirLlcRevolvingLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=fdus_LaboratoryTestingLLCRevolvingLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=fdus_MayeshWholesaleFloristLLCFirstLienDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=fdus_NWSTechnologiesLLCFirstLienDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=fdus_PayEntryFinancialServicesIncDbaPayentry-SecondLienDDTLBMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=fdus_PayEntryFinancialServicesIncDbaPayentry-SecondLienDDTLBOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=fdus_ProntoPlumbingAndDrainIncRevolvingLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=fdus_TediaCompanyLlcRevolvingLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=fdus_ThrustFlightLlcFirstLienDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=fdus_TrueEnvironmentalIncFirstLienDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=fdus_W50HoldingsLlcPreferredEquityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |