XML 74 R65.htm IDEA: XBRL DOCUMENT
v3.23.1

Financial Highlights - Schedule of Financial Highlights (Parenthetical) (Details) | 3 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
Investment Company, Financial Highlights [Abstract] |  |
Expenses other than incentive fee | 8.70% | 7.30%
Incentive fee | 3.20% | 1.10%
Total expenses | 11.90% | 8.40%
Total expenses, before base management fee waiver | 11.90% | 8.50%
Base management fee waiver | 0.00% | (0.10%)

X
- Definition Investment company, base management fee waiver. + References No definition available. + Details
Name: | fdus_InvestmentCompanyBaseManagementFeeWaiver
Namespace Prefix: | fdus_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Investment company, expense ratio to average net assets. + References No definition available. + Details
Name: | fdus_InvestmentCompanyExpenseRatioToAverageNetAssets
Namespace Prefix: | fdus_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Investment company, expenses ratio before base management fee waiver. + References No definition available. + Details
Name: | fdus_InvestmentCompanyExpensesRatioBeforeBaseManagementFeeWaiver
Namespace Prefix: | fdus_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage, after deduction of fee waiver and before deduction of incentive fee, of expense to average net assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 205 -Section 50 -Paragraph 13 -URI https://asc.fasb.org/extlink&oid=25866437&loc=d3e10342-115837 + Details
Name: | us-gaap_InvestmentCompanyExpenseRatioExcludingIncentiveFee
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_InvestmentCompanyFinancialHighlightsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of incentive fee expense to average net assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 205 -Section 50 -Paragraph 13 -URI https://asc.fasb.org/extlink&oid=25866437&loc=d3e10342-115837 + Details
Name: | us-gaap_InvestmentCompanyIncentiveFeeToAverageNetAssets
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration