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Fair Value (Details Textual) (USD $)	Jan. 31, 2014	Apr. 30, 2013
Estimated Fair Value of Warrants	$ 2,248,000	$ 1,046,000

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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