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Note 12 - Equity Investment (Details Textual) - M W L [Member] - USD ($)
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Equity Method Investment, Ownership Percentage 45.00%  
Equity Method Investment, Ownership Percentage by Non-related Party 55.00%  
Revenue from Related Parties $ 3,200,000 $ 384,000
Due to Affiliate 1,700,000  
Trade Accounts Receivable [Member]    
Due from Affiliates $ 1,000,000