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UNDISTRIBUTED NET REALIZED GAINS (LOSSES) ON INVESTMENTS (Details) (USD $)	3 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Mar. 31, 2012
UNDISTRIBUTED NET REALIZED GAINS (LOSSES) ON INVESTMENTS [Abstract]
Undistributed long term capital gains	$ 560,689		$ 498,438
Distribution made to shareholders	$ 66,826,000	$ 0
Distribution made to shareholders (in dollars per share)	$ 17.59

X

- Definition

The accumulated net realized gain (loss) from investments during the period.

+ References

No definition available.

+ Details

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X

- Definition

Distributions paid (for each shares) during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	cswc_
Data Type:	num:perShareItemType
Balance Type:	na
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- Details

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Namespace Prefix:	cswc_
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X

- Definition

Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 20

-Subparagraph a

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 18

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3291-108585

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