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Note 1 - Organization and Significant Accounting Policies - Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Balance $ 26,175 $ 34,052
Balance 22,321 26,175
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]    
Balance (1,778) (1,285)
Foreign currency translation adjustments (1) [1] 408 (493)
Balance $ (1,370) $ (1,778)
[1] In all periods presented, there were no tax impacts related to rate changes and certain foreign currency translation adjustments were reclassified to earnings in 2019. The adjustments reclassified to earnings in 2019 relate to the substantial completion of the liquidation of Fuel Tech S.p.A (Chile) during the fourth quarter of 2019.