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Note 9 - Related Party Transactions (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Legal Fees $ 16,000 $ 38,000 $ 88,000 $ 64,000
Clever Container [Member]        
Noncontrolling Interest, Ownership Percentage by Parent 28.50%   28.50%  
Clever Container [Member]        
Revenue from Related Parties $ 259,000 250,000 $ 496,000 454,000
Accounts Receivable, Related Parties $ 1,199,387 $ 831,000 $ 1,199,387 $ 831,000