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Fair Value, Assets Measured on Recurring Basis (Details) (USD $)
 9 Months Ended
Jan. 31, 2015
Derivative Financial Instruments And Risk Management Fair Value, Assets Measured On Recurring Basis 1 $ 3,703,510cpah_FairValueAssetsMeasuredOnRecurringBasisZeroTwoSevenZeroZeroZerobOnedmSevenSixGwkKWC
Derivative Financial Instruments And Risk Management Fair Value, Assets Measured On Recurring Basis 2 3,703,510cpah_FairValueAssetsMeasuredOnRecurringBasisZeroTwoSevenZeroZeroZerodVZZJJlmhcgX
Derivative Financial Instruments And Risk Management Fair Value, Assets Measured On Recurring Basis 3 3,168,559cpah_FairValueAssetsMeasuredOnRecurringBasisZeroTwoSevenZeroZeroZeroJThreemWgWOneTTmgC
Derivative Financial Instruments And Risk Management Fair Value, Assets Measured On Recurring Basis 4 3,168,559cpah_FairValueAssetsMeasuredOnRecurringBasisZeroTwoSevenZeroZeroZerorLXczmNineTwoxpNL
Derivative Financial Instruments And Risk Management Fair Value, Assets Measured On Recurring Basis 1 7,172,798cpah_FairValueAssetsMeasuredOnRecurringBasisZeroTwoSevenZeroZeroZeroOneCHNinewdGFSsSevenL
Derivative Financial Instruments And Risk Management Fair Value, Assets Measured On Recurring Basis 2 7,172,798cpah_FairValueAssetsMeasuredOnRecurringBasisZeroTwoSevenZeroZeroZeroGxwRqZeroxOneTJHn
Derivative Financial Instruments And Risk Management Fair Value, Assets Measured On Recurring Basis 3 3,401,491cpah_FairValueAssetsMeasuredOnRecurringBasisZeroTwoSevenZeroZeroZeroMdFOneSixlqdqlxh
Derivative Financial Instruments And Risk Management Fair Value, Assets Measured On Recurring Basis 4 $ 3,401,491cpah_FairValueAssetsMeasuredOnRecurringBasisZeroTwoSevenZeroZeroZeroqfTworynMKLPxNine