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Note 3 - Revenue (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Revenue from Contract with Customer, Including Assessed Tax $ 1,530 $ 4,525 $ 2,030 $ 9,375