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Note 3 - Revenue Recognition - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Revenues $ 12,907 $ 23,150 $ 39,749 $ 43,417
MEXICO        
Revenues 1,745 4,894 4,564 8,660
UNITED STATES        
Revenues 11,162 18,256 35,185 34,757
Natural Gas, Gathering, Transportation, Marketing and Processing [Member]        
Revenues 10,568 20,336 32,473 37,121
Rental [Member]        
Revenues 1,063 1,339 3,310 3,325
Service [Member]        
Revenues 1,100 1,403 3,166 2,798
Product and Service, Other [Member]        
Revenues $ 176 $ 72 $ 800 $ 173