Quarterly report pursuant to Section 13 or 15(d)

2. CAPITALIZATION AND MANAGEMENT PLANS (Details Narrative)

v2.4.1.9
2. CAPITALIZATION AND MANAGEMENT PLANS (Details Narrative) (USD $)
3 Months Ended 6 Months Ended
Oct. 31, 2014
Oct. 31, 2013
Oct. 31, 2014
Oct. 31, 2013
Apr. 30, 2014
Accumulated deficit $ (75,607,031)us-gaap_RetainedEarningsAccumulatedDeficit   $ (75,607,031)us-gaap_RetainedEarningsAccumulatedDeficit   $ (68,700,127)us-gaap_RetainedEarningsAccumulatedDeficit
Net loss $ (4,063,673)us-gaap_NetIncomeLoss $ (5,658,070)us-gaap_NetIncomeLoss $ (5,648,497)us-gaap_NetIncomeLoss $ (10,324,437)us-gaap_NetIncomeLoss  
SG Austria [Member]          
Equity interest owned 14.50%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationAxis
= nvlx_SGAustriaMember
  14.50%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationAxis
= nvlx_SGAustriaMember