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Concentrations and Credit Risk (Narrative) (Details) (USD $)
 3 Months Ended
Dec. 31, 2014
Concentrations And Credit Risk 1 10.00%cbak_ConcentrationsAndCreditRiskZeroTwoSixEightNineThreeOneSevenNineTwomWPmHhKTsFP
Concentrations And Credit Risk 2 10.00%cbak_ConcentrationsAndCreditRiskZeroTwoSixEightNineThreeOneSevenNinevHQvMJNinenpmlf
Concentrations And Credit Risk 3 10.00%cbak_ConcentrationsAndCreditRiskZeroTwoSixEightNineThreeOneSevenNineWXmgXbzEightFiveQRq
Concentrations And Credit Risk 4 $ 1,700,000cbak_ConcentrationsAndCreditRiskZeroTwoSixEightNineThreeOneSevenNineOnestyqCnXVLgH
Concentrations And Credit Risk 5 $ 21,442cbak_ConcentrationsAndCreditRiskZeroTwoSixEightNineThreeOneSevenNinegmfHgwSRPFourzB