Real Estate Investments, net - Investments in Properties (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Real Estate Properties [Line Items]
Accumulated depreciation and amortization	$ (6,776)	$ (5,350)
Net Operating Real Estate Investments	112,939	113,879
Land
Real Estate Properties [Line Items]
Net Operating Real Estate Investments	12,911	12,911
Buildings and improvements
Real Estate Properties [Line Items]
Accumulated depreciation and amortization	(5,399)	(4,524)
Net Operating Real Estate Investments	98,208	98,237
Intangible Lease Assets
Real Estate Properties [Line Items]
Accumulated depreciation and amortization	(363)
Net Operating Real Estate Investments	331	694
Construction in Progress
Real Estate Properties [Line Items]
Net Operating Real Estate Investments	158	643
Furniture, Fixtures and Equipment
Real Estate Properties [Line Items]
Accumulated depreciation and amortization	(1,014)	(826)
Net Operating Real Estate Investments	1,331	1,394
Alexander at the District
Real Estate Properties [Line Items]
Real Estate Investment Property, at Cost	70,304	69,818
Alexander at the District \| Land
Real Estate Properties [Line Items]
Real Estate Investment Property, at Cost	7,806	7,806
Alexander at the District \| Buildings and improvements
Real Estate Properties [Line Items]
Real Estate Investment Property, at Cost	60,700	59,854
Alexander at the District \| Construction in Progress
Real Estate Properties [Line Items]
Real Estate Investment Property, at Cost	158	643
Alexander at the District \| Furniture, Fixtures and Equipment
Real Estate Properties [Line Items]
Real Estate Investment Property, at Cost	1,640	1,515
Mag & May
Real Estate Properties [Line Items]
Real Estate Investment Property, at Cost	49,411	49,411
Mag & May \| Land
Real Estate Properties [Line Items]
Real Estate Investment Property, at Cost	5,105	5,105
Mag & May \| Buildings and improvements
Real Estate Properties [Line Items]
Real Estate Investment Property, at Cost	42,907	42,907
Mag & May \| Intangible Lease Assets
Real Estate Properties [Line Items]
Real Estate Investment Property, at Cost	694	694
Mag & May \| Furniture, Fixtures and Equipment
Real Estate Properties [Line Items]
Real Estate Investment Property, at Cost	$ 705	$ 705

The cumulative amount of depreciation for real estate property held for investment purposes.

Name:	us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of real estate investment property which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(1)(d))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(1)(6))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1

+ Details

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

- Definition

Amount of real estate investment property, net of accumulated depreciation, which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(1)(d))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(1)(6))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1

+ Details

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

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_RealEstatePropertiesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_LandMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_BuildingAndBuildingImprovementsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=nref_IntangibleLeaseAssetsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=nref_ConstructionInProgressIncludingNettingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=nref_FurnitureFixturesAndEquipmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=nref_AlexanderAtTheDistrictMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=nref_MagMayMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: