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Note 6 - Other Intangible Assets (Details Textual) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 19 years 219 days    
Amortization of Intangible Assets, Total $ 1.2 $ 0.3 $ 0.3