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Schedule of Stockholders Equity Deferred Share Unit Plan (Details) (USD $)
 9 Months Ended
Jan. 31, 2015
Common Stock Schedule Of Stockholders Equity Deferred Share Unit Plan 1 $ 1,672,434cpah_ScheduleOfStockholdersEquityDeferredShareUnitPlanZeroTwoSevenZeroZeroZerofFourCwJZdEightSLTw
Common Stock Schedule Of Stockholders Equity Deferred Share Unit Plan 2 1.09cpah_ScheduleOfStockholdersEquityDeferredShareUnitPlanZeroTwoSevenZeroZeroZeroTTRJvSQLNdGz
Common Stock Schedule Of Stockholders Equity Deferred Share Unit Plan 3 326,613cpah_ScheduleOfStockholdersEquityDeferredShareUnitPlanZeroTwoSevenZeroZeroZeroRKTwoTqzXRBKVm
Common Stock Schedule Of Stockholders Equity Deferred Share Unit Plan 4 1.17cpah_ScheduleOfStockholdersEquityDeferredShareUnitPlanZeroTwoSevenZeroZeroZerovsJNsrnqsThreeZL
Common Stock Schedule Of Stockholders Equity Deferred Share Unit Plan 5 0cpah_ScheduleOfStockholdersEquityDeferredShareUnitPlanZeroTwoSevenZeroZeroZeroThreexSNpOneLQkmtr
Common Stock Schedule Of Stockholders Equity Deferred Share Unit Plan 6 0cpah_ScheduleOfStockholdersEquityDeferredShareUnitPlanZeroTwoSevenZeroZeroZerobcZfpwSFiveCThreeNV
Common Stock Schedule Of Stockholders Equity Deferred Share Unit Plan 7 $ 1,999,047cpah_ScheduleOfStockholdersEquityDeferredShareUnitPlanZeroTwoSevenZeroZeroZeroLpFSixmTJxMnBM
Common Stock Schedule Of Stockholders Equity Deferred Share Unit Plan 8 1.10cpah_ScheduleOfStockholdersEquityDeferredShareUnitPlanZeroTwoSevenZeroZeroZeroThreeJZptsLhVZVg