XML 49 R35.htm IDEA: XBRL DOCUMENT
v3.22.4

Portfolio Company Investments - Additional Information (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 USD ($) Investment | Dec. 31, 2021 USD ($) Investment | Dec. 31, 2020 USD ($)
Investment Holdings [Line Items] |  |  |
Number of investment portfolio companies | Investment | 76 | 70 |
Number of residual investment porfolio companies | Investment | 2 | 8 |
Aggregate fair value of total portfolio | $ 860,329 | $ 719,124 |
Weighted average effective yield investment percentage | 13.80% | 12.30% |
Average fully diluted equity ownership percentage | 4.00% | 4.70% |
Percentage of equity investments held in portfolio companies | 74.40% | 82.10% |
Purchases of debt and equity investments | $ 333,846 | $ 346,737 | $ 189,996
Proceeds from sales and repayments | $ 193,980 | $ 472,782 | $ 210,774
Number of investments represented more than ten percentage of aggregate investment portfolio | Investment | 0 | 0 |
Investments at Fair Value | $ 860,329 | $ 719,124 |
Debt investments in portfolio companies on non-accrual status | Investment | 4 | 1 |
Pfanstiehl, Inc |  |  |
Investment Holdings [Line Items] |  |  |
Investments at Fair Value | $ 51,992 | $ 57,639 |
Investments as percentage of total assets | 5.60% | 6.40% |
Maximum |  |  |
Investment Holdings [Line Items] |  |  |
Investment maturity period | 7 years |  |
Minimum |  |  |
Investment Holdings [Line Items] |  |  |
Investment maturity period | 5 years |  |

X
- Definition Average fully diluted equity ownership Percentage. + References No definition available. + Details
Name: | fdus_AverageFullyDilutedEquityOwnershipPercentage
Namespace Prefix: | fdus_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Debt investment in number of portfolio companies on non-accrual status. + References No definition available. + Details
Name: | fdus_DebtInvestmentInNumberOfPortfolioCompaniesOnNonAccrualStatus
Namespace Prefix: | fdus_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Investment maturity period. + References No definition available. + Details
Name: | fdus_InvestmentMaturityPeriod
Namespace Prefix: | fdus_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Investments as percentage of assets. + References No definition available. + Details
Name: | fdus_InvestmentsAsPercentageOfAssets
Namespace Prefix: | fdus_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of investment porfolio companies. + References No definition available. + Details
Name: | fdus_NumberOfInvestmentPorfolioCompanies
Namespace Prefix: | fdus_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of Investments represented more than ten percentage of aggregate investment portfolio. + References No definition available. + Details
Name: | fdus_NumberOfInvestmentsRepresentedMoreThanTenPercentageOfAggregateInvestmentPortfolio
Namespace Prefix: | fdus_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of residual investment porfolio companies. + References No definition available. + Details
Name: | fdus_NumberOfResidualInvestmentPorfolioCompanies
Namespace Prefix: | fdus_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of equity investments held in portfolio companies. + References No definition available. + Details
Name: | fdus_PercentageOfEquityInvestmentsHeldInPortfolioCompanies
Namespace Prefix: | fdus_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Proceeds from sales and repayments including principal return of capital distributions and realized gains. + References No definition available. + Details
Name: | fdus_ProceedsFromSalesAndRepaymentsIncludingPrincipalReturnOfCapitalDistributionsAndRealizedGains
Namespace Prefix: | fdus_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=124260329&loc=d3e26610-111562 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
Name: | us-gaap_AvailableForSaleSecuritiesDebtSecurities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Weighted average yield of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), maturing in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher SEC -Name Industry Guide -Number 3 -Section II -Paragraph B Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1403 -Paragraph (a) -Subparagraph (1) + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleMaturityWithinOneYearWeightedAverageYield
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
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 No definition available. + Details
Name: | us-gaap_InvestmentHoldingsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Value of the investment at close of period. For schedules of investments that are categorized, the value would be aggregated by category. For investment in and advances to affiliates, if operations of any controlled companies are different in character from those of the company, group such affiliates within divisions and by type of activities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section 50 -Paragraph 6 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=99383244&loc=d3e12121-115841 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 5D -Subparagraph (SX 210.12-13D(Column C)) -URI https://asc.fasb.org/extlink&oid=122147990&loc=SL120429264-123010 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-12B(Column C)) -URI https://asc.fasb.org/extlink&oid=122147990&loc=d3e611197-123010 + Details
Name: | us-gaap_InvestmentOwnedAtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The cash outflow associated with the purchase of all investments (debt, security, other) during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3213-108585 + Details
Name: | us-gaap_PaymentsToAcquireInvestments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |