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Note 3 - Revenue Recognition - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Revenue $ 8,741 $ 11,799 $ 24,992 $ 34,151
Oil [Member]        
Revenue 7,811 8,979 21,935 28,146
Natural Gas, Midstream [Member]        
Revenue 930 2,820 3,057 6,005
Rockies [Member]        
Revenue 3,150 3,750 8,174 12,264
Rockies [Member] | Oil [Member]        
Revenue 3,106 3,407 7,914 11,385
Rockies [Member] | Natural Gas, Midstream [Member]        
Revenue 44 343 260 879
West Texas, South Texas, and Gulf Coast [Member]        
Revenue 3,241 4,372 9,540 13,656
West Texas, South Texas, and Gulf Coast [Member] | Oil [Member]        
Revenue 3,138 3,918 9,116 12,522
West Texas, South Texas, and Gulf Coast [Member] | Natural Gas, Midstream [Member]        
Revenue 103 454 424 1,134
Mid-Continent [Member]        
Revenue 2,350 3,677 7,278 8,231
Mid-Continent [Member] | Oil [Member]        
Revenue 1,567 1,654 4,905 4,239
Mid-Continent [Member] | Natural Gas, Midstream [Member]        
Revenue $ 783 $ 2,023 $ 2,373 $ 3,992