XML 62 R48.htm IDEA: XBRL DOCUMENT
v3.22.4

Fair Value Measurements - Summary of Carrying Value and Fair Value of Debt Obligations (Parenthetical) (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Fair Value Disclosures [Abstract] |  |
Secured Borrowings | $ 16,880 | $ 17,637

X
- Definition Secured borrowings. + References No definition available. + Details
Name: | fdus_SecuredBorrowings
Namespace Prefix: | fdus_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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