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Convertible Subordinated Notes (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 12, 2021	Dec. 31, 2020	Sep. 09, 2020	Mar. 19, 2014
Carrying Values of Liability and Equity Components, Convertible Subordinated Notes
Credit Facility amortization of debt issuance costs	$ 193,000	$ 200,000
Accumulated Amortization, Debt Issuance Costs	$ 937,000			$ 819,000
Convertible Subordinated Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Discount Rate		11.40%
Debt Instrument, Unamortized Debt Issuance Costs	3.10%	3.20%
Stated interest rate percentage						2.75%
Carrying Values of Liability and Equity Components, Convertible Subordinated Notes
Convertible subordinated notes, principal amount				2,559,000
Unamortized discount of liability component	$ 0			(20,000)
Debt issuance costs	0			(1,000)
Carrying value of the liability component	0		$ 200,000	2,538,000	$ 0
Carrying value of the equity component	0			319,000
Contractual coupon interest expense	18,000	$ 43,000
Accretion of discount, convertible subordinated notes	20,000	65,000
Credit Facility amortization of debt issuance costs	1,000	$ 6,000
Accumulated Amortization, Debt Issuance Costs	$ 64,000			$ 63,000

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Amount of accretion of discount for the standardized measure of discounted future net cash flow related to proved oil and gas reserves.

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