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Organization, Use of Estimates and Basis of Presentation (Details Textual) (USD $)	3 Months Ended		6 Months Ended		0 Months Ended
	Oct. 31, 2014	Oct. 31, 2013	Oct. 31, 2014	Oct. 31, 2013	Dec. 01, 2014	Apr. 30, 2014	Apr. 30, 2013
Cash and Cash Equivalents, at Carrying Value, Total	$ 575,000	$ 7,572,000	$ 575,000	$ 7,572,000		$ 5,891,000	$ 9,561,000
Working Capital	1,800,000csbr_WorkingCapital		1,800,000csbr_WorkingCapital
Income Tax Expense (Benefit)	10,000us-gaap_IncomeTaxExpenseBenefit	3,000us-gaap_IncomeTaxExpenseBenefit	15,000us-gaap_IncomeTaxExpenseBenefit	6,000us-gaap_IncomeTaxExpenseBenefit
Subsequent Event [Member] \| Convertible Promissory Note [Member]
Debt Instrument, Term					90 days
Chief Executive Officer and President [Member] \| Subsequent Event [Member] \| Convertible Promissory Note [Member]
Debt Instrument, Face Amount					2,000,000
Debt Instrument, Term					90 days

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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