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Note 6 - Concentration of Revenue
3 Months Ended
Mar. 31, 2014
Risks and Uncertainties [Abstract]  
Concentration Risk Disclosure [Text Block]

6.    Concentration of Revenue The following table indicates the percentage of consolidated revenue represented by each customer for any period in which such customer represented more than 10% of consolidated revenue.


   

Three Months Ended March 31,

 

(unaudited)

 

2014

   

2013

 

ChemFree Customer A

    17 %     13 %

ChemFree Customer B

    20 %     30 %

ChemFree Customer C

    2 %     10 %

ChemFree Customer D

    11 %     9 %