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Note 12 - Major Customers and Accounts Receivable (Details Textual)
3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2016
Jun. 30, 2017
Sep. 30, 2017
USD ($)
Sep. 30, 2016
Dec. 31, 2016
USD ($)
Allowance for Doubtful Accounts Receivable, Noncurrent $ 1,000,000     $ 1,000,000   $ 500,000
Percentage of Remaining Balance Owned Reserved     48.00% 48.00%    
Customer Concentration Risk [Member] | Sales Revenue, Net [Member]            
Concentration Risk, Number of Major Customers 2 2   2 1  
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Two Customers [Member]            
Concentration Risk, Percentage 45.00% 44.00%   32.00%    
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | One Customer [Member]            
Concentration Risk, Percentage         22.00%  
Customer Concentration Risk [Member] | Accounts Receivable [Member]            
Concentration Risk, Number of Major Customers       1    
Customer Concentration Risk [Member] | Accounts Receivable [Member] | One Customer [Member]            
Concentration Risk, Percentage       44.00%    
Customer Concentration Risk [Member] | Non-current Accounts Receivable [Member] | One Customer [Member]            
Concentration Risk, Percentage       100.00%   100.00%
Customer Concentration Risk [Member] | Current Accounts Receivable [Member] | One Customer [Member]            
Concentration Risk, Number of Major Customers           1
Concentration Risk, Percentage           81.00%