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Note 4 - Operating Assets and Liabilities - Summary of Accounts Receivable (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Trade receivables $ 50,826 $ 32,795
Other receivables 7,960 7,225
Less: Allowance for credit losses (2,793) (1,252)
Total accounts receivable, net $ 55,993 $ 38,768