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Note 12 - Equity Investment (Details Textual) - M W L [Member] - USD ($)
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Equity Method Investment, Ownership Percentage 45.00%  
Equity Method Investment, Ownership Percentage by Non-related Party 55.00%  
Revenue from Related Parties $ 4,600,000 $ 810,000
Due to Affiliate 2,100,000  
Trade Accounts Receivable [Member]    
Due from Affiliates $ 846,000