Note 2 - Revenue From Contracts With Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Oil Revenues [Member]
Revenue	$ 9,733	$ 15,506	$ 31,307	$ 45,199
Gas Revenues [Member]
Revenue	2,434	2,415	5,733	5,344
Natural Gas Liquids Revenues [Member]
Revenue	1,077	2,933	2,913	5,416
Permian / Delaware Basin [Member] \| Oil Revenues [Member]
Revenue	9,733	8,341	31,307	23,906
Permian / Delaware Basin [Member] \| Gas Revenues [Member]
Revenue	2,434	1,232	5,733	3,096
Permian / Delaware Basin [Member] \| Natural Gas Liquids Revenues [Member]
Revenue	1,077	724	2,913	1,412
Rocky Mountain [Member] \| Oil Revenues [Member]
Revenue	0	7,165	0	21,293
Rocky Mountain [Member] \| Gas Revenues [Member]
Revenue	0	1,183	0	2,248
Rocky Mountain [Member] \| Natural Gas Liquids Revenues [Member]
Revenue	$ 0	$ 2,209	$ 0	$ 4,004

Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
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Reference 10: http://www.xbrl.org/2003/role/disclosureRef
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-Publisher FASB
-Name Accounting Standards Codification
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+ Details