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Fair Value (Details Textual) (USD $) In Millions, unless otherwise specified	Jan. 31, 2013	Apr. 30, 2012
Estimated Fair Value of Warrants	$ 1.0	$ 0.6

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- Definition

The estimated fair value of warrants.

+ References

No definition available.

+ Details

Name:	csbr_EstimatedFairValueOfWarrants
Namespace Prefix:	csbr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant