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

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- References No definition available. + Details
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Namespace Prefix: | ngd_
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Period Type: | duration

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- Definition 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. + References No definition available. + Details
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Namespace Prefix: | ngd_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration