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Schedule of Stockholders Equity Non Vested Deferred Share Units (Details) (USD $)
 9 Months Ended
Jan. 31, 2015
Common Stock Schedule Of Stockholders Equity Non Vested Deferred Share Units 1 $ 156,778cpah_ScheduleOfStockholdersEquityNonVestedDeferredShareUnitsZeroTwoSevenZeroZeroZeroFiveyqTRbcNtSixgS
Common Stock Schedule Of Stockholders Equity Non Vested Deferred Share Units 2 2.16cpah_ScheduleOfStockholdersEquityNonVestedDeferredShareUnitsZeroTwoSevenZeroZeroZeroTwobfDztSevenEightMFiveyp
Common Stock Schedule Of Stockholders Equity Non Vested Deferred Share Units 3 326,613cpah_ScheduleOfStockholdersEquityNonVestedDeferredShareUnitsZeroTwoSevenZeroZeroZeroFQzSNinesTfwzfn
Common Stock Schedule Of Stockholders Equity Non Vested Deferred Share Units 4 1.17cpah_ScheduleOfStockholdersEquityNonVestedDeferredShareUnitsZeroTwoSevenZeroZeroZerolvJDgFourZeroJQpFl
Common Stock Schedule Of Stockholders Equity Non Vested Deferred Share Units 5 (231,701)cpah_ScheduleOfStockholdersEquityNonVestedDeferredShareUnitsZeroTwoSevenZeroZeroZeroXKKZerogSPzSevenFNL
Common Stock Schedule Of Stockholders Equity Non Vested Deferred Share Units 6 1.52cpah_ScheduleOfStockholdersEquityNonVestedDeferredShareUnitsZeroTwoSevenZeroZeroZeroVZSixThreeZeroWwySSNNine
Common Stock Schedule Of Stockholders Equity Non Vested Deferred Share Units 7 $ 251,690cpah_ScheduleOfStockholdersEquityNonVestedDeferredShareUnitsZeroTwoSevenZeroZeroZeroqBLfFThreedmwzdd
Common Stock Schedule Of Stockholders Equity Non Vested Deferred Share Units 8 1.47cpah_ScheduleOfStockholdersEquityNonVestedDeferredShareUnitsZeroTwoSevenZeroZeroZerodsFkTdlvJmHB