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Supplemental Cash Flow Information (Tables)
3 Months Ended
Mar. 31, 2021
Supplemental Cash Flow Information [Abstract]  
Schedule of Supplemental Cash Flow Information
    Three months ended March 31,  
(Amounts in thousands)   2021     2020  
Cash paid during the year:                
Interest expense   $ 1     $ 2  
Income taxes   $ -     $ -