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Note 4 - Notes Receivable - Notes Receivable (Details) - USD ($) $ in Thousands | 12 Months Ended
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Nov. 30, 2023 | Nov. 30, 2022 | Nov. 30, 2021
Balance – beginning of period | $ 24,421 | $ 23,572 | $ 96,016
Accretion of notes receivable (Note 4) | 579 | 849 | 2,556
Payment received | (25,000) | 0 | (75,000)
Balance – end of period | $ 0 | $ 24,421 | $ 23,572

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- Definition The amount of accretion arising from notes receivable. + References No definition available. + Details
Name: | ng_NotesReceivableAccretion
Namespace Prefix: | ng_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Represents notes receivable payments. + References No definition available. + Details
Name: | ng_NotesReceivablePayments
Namespace Prefix: | ng_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amortized cost, after allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement and net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04(5)(b)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479617/946-210-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481990/310-10-45-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-5 + Details
Name: | us-gaap_NotesReceivableNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant