Quarterly report pursuant to Section 13 or 15(d)

Consolidated Balance Sheets (Parenthetical)

v2.4.1.9
Consolidated Balance Sheets (Parenthetical) (USD $)
Feb. 28, 2015
May 31, 2014
Common stock, par value      
Common stock, shares authorized 100,000,000us-gaap_CommonStockSharesAuthorized 100,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued 59,259,116us-gaap_CommonStockSharesIssued 55,753,311us-gaap_CommonStockSharesIssued
Common stock, shares outstanding 59,259,116us-gaap_CommonStockSharesOutstanding 55,753,311us-gaap_CommonStockSharesOutstanding
Series B Convertible Preferred Stock    
Series B Convertible preferred stock, par value      
Series B Convertible preferred stock, shares authorized 400,000us-gaap_PreferredStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
400,000us-gaap_PreferredStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
Series B Convertible preferred stock, shares issued 95,100us-gaap_PreferredStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
95,100us-gaap_PreferredStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
Series B Convertible preferred stock, shares outstanding 95,100us-gaap_PreferredStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
95,100us-gaap_PreferredStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember