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Note 13 - Equity Investment (Details Textual) - M W L [Member] - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Equity Method Investment, Ownership Percentage 45.00%    
Equity Method Investment, Ownership Percentage by Non-related Party 55.00%    
Revenue from Related Parties $ 5,500,000 $ 2,200,000 $ 1,200,000
Due to Affiliate 1,200,000    
Trade Accounts Receivable [Member]      
Due from Affiliates $ 630,000