Note 5 - Oil and Natural Gas Properties - Schedule of Capitalized Costs, Impairment, and Depreciation (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Proved properties	$ 995,666	$ 970,808
Net oil and gas properties	966,518	1,040,894
Unproved properties	236,482	260,271
Land	5,382	5,382
Total oil and gas properties, net of accumulated impairments	1,237,530	1,236,461
Accumulated depreciation, depletion and amortization	(271,012)	(195,567)
Proved Oil and Natural Gas Properties [Member]
Proved properties	1,096,318	1,046,208
Accumulated impairment	(100,652)	(75,400)
Net oil and gas properties	995,666	970,808
Unproved Oil and Gas Properties [Member]
Accumulated impairment	(65,365)	(45,690)
Net oil and gas properties	236,482	260,271
Unproved properties	$ 301,847	$ 305,961

Amount before accumulated depletion of real estate held for productive use, excluding land held for sale.

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Amount of accumulated depreciation, depletion and amortization of oil and gas property carried under the successful effort method. Oil and gas property include, but not limited to, the entity's wells and related equipment and facilities.

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Accumulated impairment of oil and gas property carried under the successful effort method.

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Oil and Gas properties, gross, carried under the successful effort method.

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