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Note 9 - Business Segment Information (Tables)
12 Months Ended
Dec. 31, 2014
Segment Reporting [Abstract]  
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]
                                     
   

2014

   

%

   

2013

   

%

   

2012

   

%

 

United States

  $ 298,338       69     $ 257,038       66     $ 239,153       64  

Foreign countries

    136,587       31       134,627       34       136,538       36  

Total

  $ 434,925       100     $ 391,665       100     $ 375,691       100  
                                                 
Schedule of Segment Reporting Information, by Segment [Table Text Block]
                   
   

2014

   

2013

   

2012

 

Pumps and pump systems

  $ 379,626     $ 336,779     $ 318,235  

Repairs of pumps and pump systems and other

    55,299       54,886       57,456  

Total

  $ 434,925     $ 391,665     $ 375,691