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Organization and Nature of Business - Additional Information (Details) $ in Thousands	Jun. 20, 2011 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]
SBIC debenture program, maximum amount outstanding SBA debentures	$ 350,000

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- Definition

SBIC debenture program, maximum amount outstanding SBA debentures.

+ References

No definition available.

+ Details

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Namespace Prefix:	fdus_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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