Administrative Expenses (Details) - USD ($) $ in Millions	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025
Administrative Expenses [Abstract]
Legal, and travel expenses		$ 10.2
Restructuring costs	$ 2.6

The amount of expense provided in the period for legal costs incurred on or before the balance sheet date pertaining to resolved, pending or threatened litigation, including arbitration and mediation proceedings.

No definition available.

Name:	namm_LegalFeesForExpenses
Namespace Prefix:	namm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration