Note 15 - Foreign Exchange (Details Textual) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
General and Administrative Expense [Member]
Foreign Currency Transaction Gain (Loss), Realized	$ 0.4	$ (0.9)	$ 0.7

Amount before tax of foreign currency transaction realized gain (loss) recognized in the income statement.

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