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Note 9 - Segment Information (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Note 9 - Segment Information (Details) [Line Items]        
Number of Reportable Segments     2  
Chemicals [Member]
       
Note 9 - Segment Information (Details) [Line Items]        
Number of Reportable Segments     2  
Sales Revenue, Goods, Net [Member] | Geographic Concentration Risk [Member] | MEXICO
       
Note 9 - Segment Information (Details) [Line Items]        
Concentration Risk, Percentage 2.00% 3.00% 2.00% 3.00%
Sales Revenue, Goods, Net [Member] | Geographic Concentration Risk [Member] | Other Countries [Member]
       
Note 9 - Segment Information (Details) [Line Items]        
Concentration Risk, Percentage 1.00% 1.00% 1.00% 1.00%