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Convertible Subordinated Notes (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019	Dec. 24, 2018	Mar. 19, 2014
Debt Instrument [Line Items]
Effect of dilutive securities, Convertible junior subordinated debentures (in shares)	0			0
Carrying Values of Liability and Equity Components, Convertible Subordinated Notes
Convertible Notes amortization of debt issuance costs			$ 393,000	$ 189,000
Accumulated Amortization, Debt Issuance Costs	$ 464,000		$ 464,000		$ 337,000
Convertible Subordinated Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Discount Rate	11.40%	11.40%	11.40%	11.40%
Debt Instrument, Unamortized Debt Issuance Costs	3.20%	3.20%	3.20%	3.20%
Stated interest rate percentage							2.75%
Carrying Values of Liability and Equity Components, Convertible Subordinated Notes
Convertible subordinated notes, principal amount					6,319,000
Unamortized discount of liability component	$ (187,000)		$ (187,000)		(319,000)
Debt issuance costs	(17,000)		(17,000)		(29,000)
Carrying value of the liability component	6,115,000		6,115,000		5,971,000	$ 6,319,000
Carrying value of the equity component	789,000		789,000		789,000
Convertible subordinated notes, fair value	6,400,000		6,400,000
Convertible Notes interest expense	43,000	$ 44,000	87,000	$ 87,000
Convertible Notes accretion of debt discount	66,000	59,000	131,000	117,000
Convertible Notes amortization of debt issuance costs	6,000	$ 5,000	12,000	$ 11,000
Accumulated Amortization, Debt Issuance Costs	$ 136,000		$ 136,000		$ 130,000

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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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Including the current and noncurrent portions, the carrying value of convertible subordinated debt, as of the balance sheet date, initially scheduled to be repaid after one year or beyond the normal operating cycle if longer. This form of debt can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder, and places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of convertible debt securities using the if-converted method.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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