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Note 11 - Business Segment Information (Tables)
12 Months Ended
Dec. 31, 2021
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
  

Product Category

 
  

2021

  

2020

  

2019

 

Pumps and pump systems

 $321,263  $300,906  $341,304 

Repair parts for pumps and pump systems and other

  57,053   48,061   56,875 

Total net sales

 $378,316  $348,967  $398,179 
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]
  

Geographic Location

 
  

2021

  

2020

  

2019

 

United States

 $260,683  $246,913  $275,290 

Foreign countries

  117,633   102,054   122,889 

Total net sales

 $378,316  $348,967  $398,179