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Note 11 - Equity Investment (Details Textual) - M W L [Member] - USD ($)
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Equity Method Investment, Ownership Percentage 45.00%  
Equity Method Investment, Ownership Percentage by Non-related Party 55.00%  
Revenue from Related Parties $ 2,000,000.0 $ 4,600,000
Due from Affiliates 413,000  
Due to Affiliate $ 1,900,000