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Note 11 - Equity Investment (Details Textual) - M W L [Member] - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Equity Method Investment, Ownership Percentage 45.00%    
Equity Method Investment, Ownership Percentage by Non-related Party 55.00%    
Revenue from Related Parties $ 2.2 $ 1.2 $ 5.0
Due to Affiliate 1.8    
Trade Accounts Receivable [Member]      
Due from Affiliates $ 1.1