CONSOLIDATED STATEMENTS OF STOCKHOLDERS EQUITY (Parentheticals) (Additional Paid-in Capital [Member], USD $)	12 Months Ended
Apr. 30, 2010 March 26, 2009	Apr. 30, 2011 July 14, 2009	Apr. 30, 2010 July 14, 2009	Apr. 30, 2011 June 22, 2010	Apr. 30, 2012 December 29, 2010	Apr. 30, 2011 December 29, 2010	Apr. 30, 2012 September 2, 2011
Issuance costs related to Financings	$ 305,000	$ 133,000	$ 545,000	$ 345,000	$ 626,000	$ 291,000	$ 525,000

The total of the cash outflow during the period which has been paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt and the cost incurred directly for the issuance of equity securities.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 18, 19, 20

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3291-108585

Name:	us-gaap_PaymentOfFinancingAndStockIssuanceCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration