Note 3 - Revenue From Contracts With Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Revenue	$ 32,316	$ 44,552
Oil Sales[Member]
Revenue	28,352	36,293
Natural Gas, Midstream [Member]
Revenue	3,964	8,259
Rockies [Member]
Revenue	10,390	15,456
Rockies [Member] | Oil Sales[Member]
Revenue	10,064	14,318
Rockies [Member] | Natural Gas, Midstream [Member]
Revenue	326	1,138
West Texas, South Texas, and Gulf Coast [Member]
Revenue	12,351	17,115
West Texas, South Texas, and Gulf Coast [Member] | Oil Sales[Member]
Revenue	11,820	15,561
West Texas, South Texas, and Gulf Coast [Member] | Natural Gas, Midstream [Member]
Revenue	531	1,554
South Texas [Member]
Revenue		7,158
South Texas [Member] | Oil Sales[Member]
Revenue		6,384
South Texas [Member] | Natural Gas, Midstream [Member]
Revenue		774
Mid-Continent [Member]
Revenue	9,575	11,981
Mid-Continent [Member] | Oil Sales[Member]
Revenue	6,468	6,414
Mid-Continent [Member] | Natural Gas, Midstream [Member]
Revenue	$ 3,107	5,567
West Texas [Member]
Revenue		5,739
West Texas [Member] | Oil Sales[Member]
Revenue		5,408
West Texas [Member] | Natural Gas, Midstream [Member]
Revenue		331
Gulf Coast [Member]
Revenue		4,218
Gulf Coast [Member] | Oil Sales[Member]
Revenue		3,769
Gulf Coast [Member] | Natural Gas, Midstream [Member]
Revenue		$ 449