Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Available for Future Issuance

No definition available.

Name:	newt_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesAvailableForFutureIssuanceRollForward
Namespace Prefix:	newt_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of shares purchased for issuance under share-based payment arrangement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (l)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesPurchasedForAward
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_PlanNameAxis=newt_EmployeeStockPurchasePlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

BENEFIT PLANS - ESPP Activity (Details) - Employee Stock Purchase Plan - shares shares in Thousands	2 Months Ended			3 Months Ended					6 Months Ended			12 Months Ended
	Mar. 15, 2026	Mar. 15, 2025	Mar. 15, 2024	Jun. 30, 2026	Jun. 15, 2026	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Jun. 30, 2026	Sep. 15, 2025	Sep. 15, 2024	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Available for Future Issuance [Roll Forward]
ESPP shares authorized under the plan														200
Shares purchased (in shares)	(7)	(4)	(5)	(15)	(8)	(8)	(5)	(4)	(15)	(14)	(10)	(26)	(20)	(4)
Available for future purchases, June 30, 2026				135					135