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Note 7 - Income Taxes - Unrecognized Tax Benefits Activity (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Unrecognized tax benefits balance at January 1 $ 241 $ 454
Gross decrease in tax positions of prior years (84) (213)
Unrecognized tax benefits balance at December 31 $ 157 $ 241