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Mineral Rights and Properties - Schedule of Activity of Mineral Rights and Properties (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Mineral Rights and Properties [Roll Forward]
Beginning balance			$ 271,922,000
Depletion capitalized into inventory	$ (3,110,000)	$ 0	(7,682,000)	$ 0
Ending balance	$ 264,240,000		$ 264,240,000

X

- Definition

Depletion Capitalized Into Inventory

+ References

No definition available.

+ Details

Name:	encr_DepletionCapitalizedIntoInventory
Namespace Prefix:	encr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Mineral Rights and Properties

+ References

No definition available.

+ Details

Name:	encr_MineralRightsAndPropertiesRollForward
Namespace Prefix:	encr_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Mineral properties, net of adjustments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-SubTopic 10
-Topic 360
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482099/360-10-50-1

+ Details

Name:	us-gaap_MineralPropertiesNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant