XML 89 R67.htm IDEA: XBRL DOCUMENT v3.23.4

Note 15 - Income Taxes - Summary of Operating Loss Carryforwards (Details) $ in Thousands	Nov. 30, 2023 USD ($)
Foreign Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Net operating loss carry-forwards	$ 530,536
Domestic Tax Authority [Member] | Canada Revenue Agency [Member]
Net operating loss carry-forwards	158,140
Expiring in 2024 [Member] | Foreign Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Net operating loss carry-forwards	1,032
Expiring in 2024 [Member] | Domestic Tax Authority [Member] | Canada Revenue Agency [Member]
Net operating loss carry-forwards	0
Expiring in 2025 [Member] | Foreign Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Net operating loss carry-forwards	1,246
Expiring in 2025 [Member] | Domestic Tax Authority [Member] | Canada Revenue Agency [Member]
Net operating loss carry-forwards	0
Expiring in 2026 [Member] | Foreign Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Net operating loss carry-forwards	13,382
Expiring in 2026 [Member] | Domestic Tax Authority [Member] | Canada Revenue Agency [Member]
Net operating loss carry-forwards	17,795
Expiring in 2027 [Member] | Foreign Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Net operating loss carry-forwards	18,493
Expiring in 2027 [Member] | Domestic Tax Authority [Member] | Canada Revenue Agency [Member]
Net operating loss carry-forwards	1,777
Expiring in 2028 [Member] | Foreign Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Net operating loss carry-forwards	85
Expiring in 2028 [Member] | Domestic Tax Authority [Member] | Canada Revenue Agency [Member]
Net operating loss carry-forwards	0
Expiring in 2029 [Member] | Foreign Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Net operating loss carry-forwards	11,223
Expiring in 2029 [Member] | Domestic Tax Authority [Member] | Canada Revenue Agency [Member]
Net operating loss carry-forwards	11,515
Expiring in 2030 [Member] | Foreign Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Net operating loss carry-forwards	10,916
Expiring in 2030 [Member] | Domestic Tax Authority [Member] | Canada Revenue Agency [Member]
Net operating loss carry-forwards	15,322
Expiring in 2031 [Member] | Foreign Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Net operating loss carry-forwards	16,580
Expiring in 2031 [Member] | Domestic Tax Authority [Member] | Canada Revenue Agency [Member]
Net operating loss carry-forwards	15,249
Expiring in 2032 [Member] | Foreign Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Net operating loss carry-forwards	309,772
Expiring in 2032 [Member] | Domestic Tax Authority [Member] | Canada Revenue Agency [Member]
Net operating loss carry-forwards	18,610
Expiring in 2033 [Member] | Foreign Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Net operating loss carry-forwards	14,529
Expiring in 2033 [Member] | Domestic Tax Authority [Member] | Canada Revenue Agency [Member]
Net operating loss carry-forwards	14,044
Expiring in 2034 [Member] | Foreign Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Net operating loss carry-forwards	15,607
Expiring in 2034 [Member] | Domestic Tax Authority [Member] | Canada Revenue Agency [Member]
Net operating loss carry-forwards	10,104
Expiring in 2035 [Member] | Foreign Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Net operating loss carry-forwards	16,383
Expiring in 2035 [Member] | Domestic Tax Authority [Member] | Canada Revenue Agency [Member]
Net operating loss carry-forwards	9,227
Expiring in 2036 [Member] | Foreign Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Net operating loss carry-forwards	14,764
Expiring in 2036 [Member] | Domestic Tax Authority [Member] | Canada Revenue Agency [Member]
Net operating loss carry-forwards	9,080
Expiring in 2037 [Member] | Foreign Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Net operating loss carry-forwards	14,111
Expiring in 2037 [Member] | Domestic Tax Authority [Member] | Canada Revenue Agency [Member]
Net operating loss carry-forwards	6,037
Expiring in 2038 [Member] | Foreign Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Net operating loss carry-forwards	0
Expiring in 2038 [Member] | Domestic Tax Authority [Member] | Canada Revenue Agency [Member]
Net operating loss carry-forwards	6,153
Expiring in 2039 [Member] | Foreign Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Net operating loss carry-forwards	0
Expiring in 2039 [Member] | Domestic Tax Authority [Member] | Canada Revenue Agency [Member]
Net operating loss carry-forwards	5,578
Expiring in 2040 [Member] | Foreign Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Net operating loss carry-forwards	0
Expiring in 2040 [Member] | Domestic Tax Authority [Member] | Canada Revenue Agency [Member]
Net operating loss carry-forwards	6,642
Expiring In 2041 [Member] | Foreign Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Net operating loss carry-forwards	0
Expiring In 2041 [Member] | Domestic Tax Authority [Member] | Canada Revenue Agency [Member]
Net operating loss carry-forwards	0
Expiring in 2042 [Member] | Foreign Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Net operating loss carry-forwards	0
Expiring in 2042 [Member] | Domestic Tax Authority [Member] | Canada Revenue Agency [Member]
Net operating loss carry-forwards	6,854
Expiring 2043 [Member] | Foreign Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Net operating loss carry-forwards	0
Expiring 2043 [Member] | Domestic Tax Authority [Member] | Canada Revenue Agency [Member]
Net operating loss carry-forwards	4,153
Indefinite [Member] | Foreign Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Net operating loss carry-forwards	72,413
Indefinite [Member] | Domestic Tax Authority [Member] | Canada Revenue Agency [Member]
Net operating loss carry-forwards	$ 0

X

- Definition

Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482685/740-10-50-3

+ Details

Name:	us-gaap_OperatingLossCarryforwards
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_IncomeTaxAuthorityAxis=us-gaap_ForeignCountryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_IncomeTaxAuthorityNameAxis=us-gaap_InternalRevenueServiceIRSMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_IncomeTaxAuthorityAxis=us-gaap_DomesticCountryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_IncomeTaxAuthorityNameAxis=us-gaap_CanadaRevenueAgencyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_TaxPeriodAxis=ng_ExpiringIn2024Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_TaxPeriodAxis=ng_ExpiringIn2025Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_TaxPeriodAxis=ng_ExpiringIn2026Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_TaxPeriodAxis=ng_ExpiringIn2027Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_TaxPeriodAxis=ng_ExpiringIn2028Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_TaxPeriodAxis=ng_ExpiringIn2029Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_TaxPeriodAxis=ng_ExpiringIn2030Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_TaxPeriodAxis=ng_ExpiringIn2031Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_TaxPeriodAxis=ng_ExpiringIn2032Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_TaxPeriodAxis=ng_ExpiringIn2033Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_TaxPeriodAxis=ng_ExpiringIn2034Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_TaxPeriodAxis=ng_ExpiringIn2035Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_TaxPeriodAxis=ng_ExpiringIn2036Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_TaxPeriodAxis=ng_ExpiringIn2037Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_TaxPeriodAxis=ng_ExpiringIn2038Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_TaxPeriodAxis=ng_ExpiringIn2039Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_TaxPeriodAxis=ng_ExpiringIn2040Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_TaxPeriodAxis=ng_ExpiringIn2041Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_TaxPeriodAxis=ng_ExpiringIn2042Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_TaxPeriodAxis=ng_Expiring2043Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_TaxPeriodAxis=ng_IndefiniteMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: