Note 16 - Supplemental Oil and Gas Disclosures (Unaudited) - Proved Developed and Undeveloped Reserves (Details) - bbl bbl in Thousands	Dec. 31, 2022	Dec. 31, 2021
Oil [Member]
Proved developed reserves (Barrel of Oil)	3,300	6,883
Proved undeveloped reserves (Barrel of Oil)	0	0
Natural Gas Liquids [Member]
Proved developed reserves (Barrel of Oil)	1,508	2,914
Proved undeveloped reserves (Barrel of Oil)	0	0
Natural Gas [Member]
Proved developed reserves (Barrel of Oil)	18,847	30,158
Proved undeveloped reserves (Barrel of Oil)	0	0
Oil Equivalents [Member]
Proved developed reserves (Barrel of Oil)	7,949	14,823
Proved undeveloped reserves (Barrel of Oil)	0	0

Net quantities of an enterprise's interests in proved developed reserves of either crude oil (including condensate and natural gas liquids), natural gas, synthetic oil and gas, or other nonrenewable natural resource that is intended to be upgraded into synthetic oil and gas as of the beginning and the end of the year. "Net" quantities of reserves include those relating to the enterprise's operating and nonoperating interests in properties. Quantities of reserves relating to royalty interests owned are included in "net" quantities if the necessary information is available to the enterprise. "Net" quantities does not include reserves relating to interests of others in properties owned by the enterprise. The unit of measure for reserve quantities is defined as "barrels" for oil and synthetic oil reserves or "cubic feet" or "cubic meters" for natural gas and synthetic gas reserves.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Form 20-F
-Section Item 18
-Subsection Instruction 2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 4
-URI https://asc.fasb.org/extlink&oid=126939881&loc=d3e61797-109447

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