9876543210 9876543210 2008-01-312008-12-31 local:u1 local:u2
6-K
Concept Label
Concept Value
DerivedElectricCurrentItemTypeConcept
Amendment Flag
false
Current Fiscal Year End Date
--12-31
Document Period End Date
2008-12-31
Document Type
6-K
Entity Registrant Name
ng_DerivedElectricCurrentItemTypeConcept_u1_u2