Commitments and Contingencies - Additional Information (Details)				3 Months Ended	12 Months Ended
	May 08, 2020 USD ($)	Oct. 11, 2018 USD ($)	Feb. 24, 2014	Mar. 31, 2021 USD ($) Vendor	Dec. 31, 2020 USD ($) Vendor	Dec. 31, 2019 USD ($)
Other Commitments [Line Items]
Commitments to purchase natural gas on take-or-pay basis with number of vendors | Vendor				3	3
Estimated remaining commitment liability				$ 100,000	$ 900,000
Collateral deposit						$ 900,000
Letter of credit, description				EAF is required to provide financial security in the form of a letter of credit originally in the amount of $0.5 million, which amount may decrease annually during the term of the agreement and was equal to $0.2 million and $0.3 million as of March 31, 2021 and December 31, 2020.
Paycheck Protection Program Loan [Member]
Other Commitments [Line Items]
Proceeds from loan	$ 2,000,000
Incremental Natural Gas Facilities Agreement [Member]
Other Commitments [Line Items]
Upfront cost				$ 0
Term of agreement			5 years	10 years
Required payments to install pipeline				$ 100,000
Incremental Natural Gas Facilities Agreement [Member] | Letter of Credit [Member]
Other Commitments [Line Items]
Principal amount				500,000
Annual decrease in financial security				$ (200,000)	$ (300,000)
El Toro [Member]
Other Commitments [Line Items]
Loss contingency, damages awarded value		$ 200,000