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Note 10 - Related Party Transactions (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Legal Fees $ 0 $ 29,000 $ 88,000 $ 93,000
Clever Container [Member]        
Noncontrolling Interest, Ownership Percentage by Parent 28.50%   28.50%  
Clever Container [Member]        
Revenue from Related Parties $ 198,000 262,000 $ 640,000 716,000
Accounts Receivable, Related Parties $ 1,278,000 $ 924,000 $ 1,278,000 $ 924,000