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COMMITMENTS (Details) (USD $) | Sep. 30, 2012
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COMMITMENTS [Abstract] |
Investment in portfolio companies, at maximum | $ 10,138,169
Number of portfolio companies, at maximum | 9

X
- Definition The maximum amount the entity has agreed to invest in portfolio companies. + References No definition available. + Details
Name: | cswc_InvestmentInPortfolioCompaniesMaximum
Namespace Prefix: | cswc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The maximum number of portfolio companies the entity has agreed to invest in, subject to certain conditions. + References No definition available. + Details
Name: | cswc_NumberOfPortfolioCompaniesMaximum
Namespace Prefix: | cswc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration