Note 4 - Concentrations (Tables)
 12 Months Ended
Dec. 31, 2014
Risks and Uncertainties [Abstract]  
Schedules of Concentration of Risk, by Risk Factor [Table Text Block]
   

December 31,

 

Accounts Receivable

 

2014

   

2013

 

Customer A

    *       11%  

Customer B

    *       *  

Customer C

    18%       *  
   

Year Ended December 31,

 

Revenue

 

2014

   

2013

   

2012

 

Customer A

    13%       12%       19%  

Customer B

    *       15       15  

Customer C

    *       *       *