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ORGANIZATION AND BASIS OF PRESENTATION (Details) | Dec. 31, 2012
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ORGANIZATION AND BASIS OF PRESENTATION [Abstract] |
Percentage of voting securities, minimum, Control Investments (in hundredths) | 25.00%
Percentage of board representation, minimum, Control Investments (in hundredths) | 50.00%
Percentage of voting securities, minimum, Affiliated Investments (in hundredths) | 5.00%
Percentage of voting securities, maximum, Affiliated Investments (in hundredths) | 25.00%

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- Definition Minimum percentage of board representation that the entity has the right to maintain to be classified as a Control Investment. + References No definition available. + Details
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Period Type: | instant

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- Definition Maximum percentage of voting securities owned by the entity to be classified as an Affiliated Investment. + References No definition available. + Details
Name: | cswc_PercentageOfVotingSecuritiesMaximumAffiliatedInvestments
Namespace Prefix: | cswc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Minimum percentage of voting securities owned by the entity to be classified as an Affiliated Investment. + References No definition available. + Details
Name: | cswc_PercentageOfVotingSecuritiesMinimumAffiliatedInvestments
Namespace Prefix: | cswc_
Data Type: | num:percentItemType
Balance Type: | na
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- Definition Minimum percentage of voting securities owned by the entity to be classified as a Control Investment. + References No definition available. + Details
Name: | cswc_PercentageOfVotingSecuritiesMinimumControlInvestments
Namespace Prefix: | cswc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
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