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Note 11 - Major Customers and Accounts Receivable (Details Textual) - Customer Concentration Risk [Member]
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Sales Revenue, Net [Member] | Three Customers Member          
Concentration Risk, Percentage 48.00%   48.00%    
Sales Revenue, Net [Member] | One Customer Member          
Concentration Risk, Percentage   81.00%   63.00%  
Sales Revenue, Net [Member]          
Concentration Risk, Number of Major Customers 3 1 3 1  
Accounts Receivable [Member] | Three Customers Member          
Concentration Risk, Percentage         87.00%
Accounts Receivable [Member] | One Customer Member          
Concentration Risk, Percentage     90.00%    
Accounts Receivable [Member]          
Concentration Risk, Number of Major Customers     1   3