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Note 13 - Revenues (Details Textual) - USD ($)
$ in Thousands
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Contract with Customer, Liability, Total $ 3,559 $ 3,652 $ 3,949 $ 3,550 $ 3,532 $ 3,820