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Note 12 - Major Customers and Accounts Receivable (Details Textual)
3 Months Ended 12 Months Ended
Mar. 31, 2017
USD ($)
Mar. 31, 2016
Dec. 31, 2016
USD ($)
Allowance for Doubtful Accounts Receivable, Noncurrent $ 1,000,000   $ 500,000
Percentage of Remaining Balance Owned Reserved 48.00%    
Customer Concentration Risk [Member] | Sales Revenue, Net [Member]      
Concentration Risk, Number of Major Customers 3 3  
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Three Customers Member      
Concentration Risk, Percentage 70.00% 58.00%  
Customer Concentration Risk [Member] | Current Accounts Receivable [Member]      
Concentration Risk, Number of Major Customers 2    
Customer Concentration Risk [Member] | Current Accounts Receivable [Member] | Two Customers [Member]      
Concentration Risk, Percentage 40.00%    
Customer Concentration Risk [Member] | Current Accounts Receivable [Member] | One Customer [Member]      
Concentration Risk, Number of Major Customers     1
Concentration Risk, Percentage     81.00%
Customer Concentration Risk [Member] | Non-current Accounts Receivable [Member] | One Customer [Member]      
Concentration Risk, Number of Major Customers 1   1
Concentration Risk, Percentage 100.00%   100.00%