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Note 11 - Equity Investment (Details Textual) - M W L [Member] - USD ($)
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Equity Method Investment, Ownership Percentage 45.00%  
Equity Method Investment, Ownership Percentage by Non-related Party 55.00%  
Revenue from Related Parties $ 1,200,000 $ 3,200,000
Due from Affiliates 407,000  
Due to Affiliate $ 1,400,000