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Note 4 - Operating Assets and Liabilities - Allowance for Doubtful Accounts (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Beginning balance $ 3,255 $ 2,843 $ 2,541 $ 1,252
Additions - charged to costs and expenses 2,979 2,190 6,774 4,812
Deductions - write-offs (4,324) (3,580) (10,216) (7,931)
Recoveries collected 1,323 1,340 4,134 4,660
Ending balance $ 3,233 $ 2,793 $ 3,233 $ 2,793