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Note 3 - Cash, Cash Equivalents - Schedule of Cash, Cash Equivalents and Term Deposits (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement Line Items [Line Items]      
Cash and cash equivalents $ 94,008 $ 72,360 $ 130,180
Bottom of range [member]      
Statement Line Items [Line Items]      
Cash and cash equivalents $ 94,008