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Disaggregated Revenue and Deferred Revenue - Narrative (Details) $ in Millions	Dec. 31, 2024 USD ($)
Revenue from Contract with Customer [Abstract]
Fulfillment costs	$ 21.1

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- Definition

Capitalized Contract Cost, Fulfillment Costs

+ References

No definition available.

+ Details

Name:	nni_CapitalizedContractCostFulfillmentCosts
Namespace Prefix:	nni_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- References

No definition available.

+ Details

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