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Note 10 - Equity Investment (Details Textual) - M W L [Member] - USD ($)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Equity Method Investment, Ownership Percentage 45.00%  
Equity Method Investment, Ownership Percentage by Non-related Party 55.00%  
Revenue from Related Parties $ 585,000 $ 1,500,000
Due to Affiliate 1,400,000  
Trade Accounts Receivable [Member]    
Due from Affiliates $ 303,000