Note 20 - Supplemental Oil and Gas Disclosures - Schedule of Depreciation, Depletion, Amortization and Accretion Expense (Details) - USD ($)	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Depreciation, depletion, amortization and accretion per Boe	$ 10.01	$ 11.24	$ 10.68

Represents depreciation depletion amortization and accretion per Barrel of oil equivalent (Boe).

No definition available.

Name:	wti_DepreciationDepletionAmortizationAndAccretionPerBoe
Namespace Prefix:	wti_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration