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ACCUMULATED NET REALIZED GAINS (Details) (USD $) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Mar. 31, 2012
ACCUMULATED NET REALIZED GAINS (LOSSES) ON INVESTMENTS [Abstract] |  |  |  |  |
Distributed net capital gains |  |  | $ 17.59 |  |
Accumulated long term capital gains | $ 1,820,574 |  | $ 1,820,574 |  | $ 498,438
Long-term capital gains federal taxes | 1,125,000 | 1,249,000 | 1,125,000 | 1,249,000 |
Net realized gains deemed distributed |  |  | $ 1,194,000 | $ 3,216,000 |

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

X
- Details
Name: | cswc_AccumulatedNetRealizedGainsLossesOnInvestmentsAbstract
Namespace Prefix: | cswc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The component of income tax expense for the period representing amounts of income taxes paid or payable (or refundable) for the period for gain on the sale of investments. + References No definition available. + Details
Name: | cswc_CurrentIncomeTaxExpenseBenefitGainOnSaleOfInvestments
Namespace Prefix: | cswc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- 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

X
- Definition This item represents the total realized gain (loss) during the reporting period for long-term capital gains that are distributed to its shareholders. + References No definition available. + Details
Name: | cswc_NetRealizedGainsDeemedDistributedToShareholders
Namespace Prefix: | cswc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration