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Note 2 - Revenue Recognition - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Revenues $ 19,770 $ 26,842
UNITED STATES    
Revenues 18,507 24,023
MEXICO    
Revenues 1,263 2,819
Natural Gas, Gathering, Transportation, Marketing and Processing [Member]    
Revenues 15,413 21,905
Rental [Member]    
Revenues 2,173 2,247
Service [Member]    
Revenues 1,924 2,066
Product and Service, Other [Member]    
Revenues $ 260 $ 624