Note 2 - Revenue From Contracts With Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Oil Revenues [Member]
Revenue	$ 11,283	$ 15,768	$ 21,574	$ 29,693
Gas Revenues [Member]
Revenue	2,168	1,259	3,299	2,929
Natural Gas Liquids Revenues [Member]
Revenue	1,078	1,414	1,836	2,483
Permian / Delaware Basin [Member] \| Oil Revenues [Member]
Revenue	11,283	8,399	21,574	15,565
Permian / Delaware Basin [Member] \| Gas Revenues [Member]
Revenue	2,168	749	3,299	1,864
Permian / Delaware Basin [Member] \| Natural Gas Liquids Revenues [Member]
Revenue	1,078	420	1,836	689
Rocky Mountain [Member] \| Oil Revenues [Member]
Revenue	0	7,369	0	14,128
Rocky Mountain [Member] \| Gas Revenues [Member]
Revenue	0	510	0	1,065
Rocky Mountain [Member] \| Natural Gas Liquids Revenues [Member]
Revenue	$ 0	$ 994	$ 0	$ 1,794

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
-Topic 280
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-Section 50
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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
-Publisher FASB
-Name Accounting Standards Codification
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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
-Publisher FASB
-Name Accounting Standards Codification
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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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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-Section S99
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+ Details