FUTURE CHANGES IN ACCOUNTING POLICIES (Details Textual)	Jan. 06, 2016
Future changes in accounting policies [Abstract]
Lease term, maximum	12 months

The 12 months is the maximum amount of time for which the lessee may choose not to recognize assets and liabilities under the new lessee accounting model.

No definition available.

Name:	ngd_LeaseTermmaximum
Namespace Prefix:	ngd_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration