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Note 13 - Related Party Transactions (Details Textual) - Client In Which CEO Holds Significant Ownership [Member] - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Accounts Receivable, Related Parties $ 0   $ 0   $ 137
Revenue from Related Parties $ 0 $ 69 $ 33 $ 214