Note 2 - Basis of Presentation and Summary of Significant Accounting Policies (Details Textual) - USD ($)	1 Months Ended	4 Months Ended	8 Months Ended	12 Months Ended		20 Months Ended	36 Months Ended
	Dec. 31, 2020	Dec. 31, 2020	Aug. 21, 2020	Dec. 31, 2021	Dec. 31, 2020	Aug. 21, 2020	Dec. 31, 2020	Aug. 22, 2020
Accounts Receivable, after Allowance for Credit Loss, Current, Total	$ 7,722,000	$ 7,722,000		$ 39,378,000	$ 7,722,000		$ 7,722,000	$ 3,027,000
Income Taxes Receivable	3,200,000	3,200,000		3,200,000	3,200,000		3,200,000
Oil and Gas Joint Interest Billing Receivables	345,000	345,000		3,100,000	345,000		345,000
Accounts Receivable, Allowance for Credit Loss, Current	$ 0	0		0	0		0
Class of Warrant or Right, Exercised During Period (in shares)	312,711
Proceeds from Warrant Exercises		0	$ 0	5,466,000			3,600,000
Subscription Receivable, Current	$ 3,596,000	3,596,000		0	3,596,000		3,596,000
Prepaid Expense	2,300,000	2,300,000		7,200,000	2,300,000		2,300,000
Inventory, Raw Materials and Supplies, Gross, Total	121,000	121,000		3,300,000	121,000		121,000
Inventory, LIFO Reserve	0	0		0	0		0
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Ending Balance	237,000	237,000		438,000	237,000		237,000
Payments of Debt Issuance Costs		405,000	(0)	2,169,000
Amortization of Debt Issuance Costs		4,000	0	498,000
Accounts Payable and Accrued Liabilities, Current, Total	22,400,000	22,400,000		103,000,000.0	22,400,000		22,400,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total				0
Income Tax Expense (Benefit), Total		(4,223,000)	$ 0	$ 16,904,000		$ 0
Number of Operating Segments				1
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Open Tax Year				2017 2018 2019 2020
Minimum [Member]
Oil and Natural Gas Marketing Contracts, Term Over Which Consideration is Received from Purchaser (Month)				1 month
Maximum [Member]
Oil and Natural Gas Marketing Contracts, Term Over Which Consideration is Received from Purchaser (Month)				2 months
Revolving Credit Facility [Member]
Debt Issuance Costs, Gross				$ 2,600,000
Payments of Debt Issuance Costs				2,200,000
Amortization of Debt Issuance Costs				$ 498,000	4,000
Technology Equipment [Member]
Property, Plant and Equipment, Useful Life (Year)				3 years
Transportation Equipment [Member]
Property, Plant and Equipment, Useful Life (Year)				5 years
Field Equipment [Member]
Property, Plant and Equipment, Useful Life (Year)				7 years
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Largest Purchaser [Member]
Concentration Risk, Percentage				94.00%
Refunds From Pipe Suppliers [Member]
Accounts Receivable, after Allowance for Credit Loss, Current, Total	0	0		$ 3,200,000	0		0
Settlements of Derivative Contracts [Member]
Accounts Receivable, after Allowance for Credit Loss, Current, Total	0	0		771,000	0		0
Aid-in-construction Receivables [Member] | WTG Gas Processing, L.P. [Member]
Accounts Receivable, after Allowance for Credit Loss, Total				3,900,000
Crude Oil, Natural Gas and Natural Gas Liquids [Member]
Accounts Receivable, after Allowance for Credit Loss, Current, Total	$ 4,200,000	$ 4,200,000		$ 29,300,000	$ 4,200,000		$ 4,200,000