Note 11 - Segment Information - Schedule of Segment Information (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Nonrecurring executive compensation	$ 6,640	$ 0	$ 0
Tax benefit on nonrecurring executive compensation	468	0	0
Non-cash share-based compensation expense	3,312	284	935
Tax benefit on noncash stock compensation	$ 346	$ 70	$ 228

Amount of executive compensation that is infrequent in occurrence or unusual in nature.

No definition available.

Name:	nrc_NonrecurringExecutiveCompensation
Namespace Prefix:	nrc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of share-based compensation tax benefit from compensation expense.

+ References

No definition available.

+ Details

Name:	nrc_ShareBasedCompensationTaxBenefitFromCompensationExpense
Namespace Prefix:	nrc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of tax benefit on nonrecurring executive compensation that is infrequent in occurrence or unusual in nature.

+ References

No definition available.

+ Details

Name:	nrc_TaxBenefitNonrecurringExecutiveCompensation
Namespace Prefix:	nrc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of noncash expense for share-based payment arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (a)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-28

+ Details

Name:	us-gaap_ShareBasedCompensation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration