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Note 11 - Business Segment Information (Tables)
12 Months Ended
Dec. 31, 2020
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
  

Product Category

 
  

2020

  

2019

  

2018

 

Pumps and pump systems

 $300,906  $341,304  $357,882 

Repair parts for pumps and pump systems and other

  48,061   56,875   56,452 

Total net sales

 $348,967  $398,179  $414,334 
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]
  

Geographic Location

 
  

2020

  

2019

  

2018

 

United States

 $246,913  $275,290  $271,820 

Foreign countries

  102,054   122,889   142,514 

Total net sales

 $348,967  $398,179  $414,334