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Note 3 - Revenue Recognition - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Revenue $ 4,957 $ 8,741 $ 16,394 $ 24,992
Oil Sales[Member]        
Revenue 4,375 7,811 14,574 21,935
Natural Gas, Midstream [Member]        
Revenue 582 930 1,820 3,057
Rockies [Member]        
Revenue 1,896 3,150 5,741 8,175
Rockies [Member] | Oil Sales[Member]        
Revenue 1,851 3,106 5,614 7,915
Rockies [Member] | Natural Gas, Midstream [Member]        
Revenue 45 44 127 260
West Texas, South Texas, and Gulf Coast [Member]        
Revenue 1,107 3,241 4,627 9,539
West Texas, South Texas, and Gulf Coast [Member] | Oil Sales[Member]        
Revenue 1,107 3,138 4,513 9,115
West Texas, South Texas, and Gulf Coast [Member] | Natural Gas, Midstream [Member]        
Revenue 0 103 114 424
Mid-Continent [Member]        
Revenue 1,954 2,350 6,026 7,278
Mid-Continent [Member] | Oil Sales[Member]        
Revenue 1,417 1,567 4,447 4,905
Mid-Continent [Member] | Natural Gas, Midstream [Member]        
Revenue $ 537 $ 783 $ 1,579 $ 2,373