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Provision for Income Taxes (Details 1)
12 Months Ended
Apr. 30, 2014
Apr. 30, 2013
Federal income tax at statutory rate 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
State income tax, net of federal benefit 2.10%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 2.60%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Permanent differences (5.60%)csbr_EffectiveIncomeTaxRateReconciliationPermanentDifferences (0.50%)csbr_EffectiveIncomeTaxRateReconciliationPermanentDifferences
Other (2.10%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 1.60%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Change in valuation allowance (27.20%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance (39.60%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
Changes in tax rates (1.40%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits 1.70%us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits
Income tax expense (0.20%)us-gaap_EffectiveIncomeTaxRateContinuingOperations (0.20%)us-gaap_EffectiveIncomeTaxRateContinuingOperations