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ACCUMULATED NET REALIZED GAINS (LOSSES) ON INVESTMENTS (Details) (USD $) | 12 Months Ended |
--- | --- | ---
Mar. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2012
ACCUMULATED NET REALIZED GAINS (LOSSES) ON INVESTMENTS [Abstract] |  |  |
Distributed net capital gains (in dollars per share) | $ 20.34 | $ 17.59 |
Accumulated long term capital gains | $ 10,436,526 |  | $ 498,438

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- Definition The accumulated net realized gain (loss) from investments during the period. + References No definition available. + Details
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Namespace Prefix: | cswc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Refers to distributed net capital gains. + References No definition available. + Details
Name: | cswc_DistributedNetCapitalGains
Namespace Prefix: | cswc_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration