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Note I - Business Segment Information (Tables)
12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]
   
2016
   
%
   
2015
   
%
   
2014
   
%
 
United States
  $
250,872
     
66
    $
269,628
     
66
    $
298,338
     
69
 
Foreign countries
   
131,199
     
34
     
136,522
     
34
     
136,587
     
31
 
Total
  $
382,071
     
100
     
406,150
     
100
     
434,925
     
100
 
Schedule of Segment Reporting Information, by Segment [Table Text Block]
   
2016
   
2015
   
2014
 
Pumps and pump systems
  $
328,973
    $
352,652
    $
379,626
 
Repairs of pumps and pump systems and other
   
53,098
     
53,498
     
55,299
 
Total
  $
382,071
    $
406,150
    $
434,925