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COMMITMENTS (Details) (USD $)	Jun. 30, 2012	Jun. 28, 2012	Mar. 31, 2012
COMMITMENTS [Abstract]
Investment in portfolio companies, at maximum	$ 10,138,169
Number of portfolio companies, at maximum	9
Investment in Titan Liner, Inc		5,950,000
Commitments payable	$ 5,950,000		$ 0

X

- Definition

The floor amount as of the balance sheet date that the entity must expend to satisfy the terms of disclosed arrangements in which the entity has agreed to expend funds to make investment.

+ References

No definition available.

+ Details

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Namespace Prefix:	cswc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The cost of investment, related to a commitment, completed during the period.

+ References

No definition available.

+ Details

Name:	cswc_InvestmentAtCostCompleted
Namespace Prefix:	cswc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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

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