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Areas of Operation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Areas of Operation    
Operating Revenues $ 24,695 $ 86,100
Net Property and Equipment 26,349 38,900
Right-of-use Assets 4,435 5,494
United States    
Areas of Operation    
Operating Revenues 17,772 73,983
Net Property and Equipment 22,446 33,162
Right-of-use Assets 3,977 4,900
Canada    
Areas of Operation    
Operating Revenues 6,923 12,117
Net Property and Equipment 3,903 5,738
Right-of-use Assets $ 458 $ 594