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Note 9 - Related Party Transactions (Details Textual) - USD ($)
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Legal Fees $ 72,000 $ 26,000
Clever Container [Member]    
Noncontrolling Interest, Ownership Percentage by Parent 28.50%  
Clever Container [Member]    
Revenue from Related Parties $ 237,000 204,000
Accounts Receivable, Related Parties $ 1,102,000 $ 711,000