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Note 15 - Significant Customers (Tables)
12 Months Ended
Dec. 31, 2015
Risks and Uncertainties [Abstract]  
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]
    Year Ended December 31,  

Customers

 

2015

   

2014

   

2013

 

Distributor A

    24 %     26 %     32 %
Distributor B     *       *       10 %
Schedule of Accounts Receivable by Major Customers by Reporting Segments [Table Text Block]
   

December 31,

 

Customers

 

2015

   

2014

 

Distributor A

    28 %     31 %

Distributor B

    17 %     10 %