CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
CURRENT ASSETS
Cash and cash equivalents	$ 47,141	$ 19,315
Due from related party (Note 4)	$ 2,277	$ 1,614
Accounts Receivable, after Allowance for Credit Loss, Current, Related Party [Extensible Enumeration]	us-gaap:RelatedPartyMember	us-gaap:RelatedPartyMember
Prepaid expenses and other	$ 288	$ 230
Total Current Assets	49,706	21,159
Restricted cash	204	202
Right of use asset (Note 6)	170	198
Land	2,240	2,240
Total Assets	52,627	24,120
CURRENT LIABILITIES
Accounts payable and accrued liabilities	1,455	1,340
Lease liability, current (Note 6)	149	153
Total Current Liabilities	1,604	1,493
Reclamation obligation	185	185
Lease liability, long-term (Note 6)	37	61
Other long-term liabilities	92	92
Total Liabilities	1,918	1,831
Commitments and Contingencies (Note 8)
SHAREHOLDERS' EQUITY:
Common shares, no par value - unlimited shares authorized; shares outstanding at March 31, 2026 and December 31, 2025 of 645,368,390 and 516,134,712, respectively	204,726	174,173
Additional paid-in capital	29,106	29,106
Accumulated deficit	(183,123)	(180,990)
Total Shareholders' Equity	50,709	22,289
Total Liabilities and Shareholders' Equity	52,627	24,120
Buildings
CURRENT ASSETS
Building and equipment, net	203	209
Equipment
CURRENT ASSETS
Building and equipment, net	$ 104	$ 112

Amount before accumulated depletion of real estate held for productive use, excluding land held for sale.

No definition available.

Name:	reemf_InvestmentInLand
Namespace Prefix:	reemf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Sum of the carrying values as of the balance sheet date of obligations incurred through that date and due within one year (or the operating cycle, if longer), including liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received, taxes, interest, rent and utilities, accrued salaries and bonuses, payroll taxes and fringe benefits.