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Note 4 - Goodwill and Intangible Assets - Change in Carrying Amount of Goodwill (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Balance at beginning of year $ 57,381 $ 57,304
Effect of change in currency translation 1,209 77
Balance at end of year $ 58,590 $ 57,381