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Note 12 - Business Segment Information (Tables)
12 Months Ended
Dec. 31, 2022
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
   

Product Category

 
   

2022

   

2021

   

2020

 

Pumps and pump systems

  $ 458,890     $ 321,263     $ 300,906  

Repair parts for pumps and pump systems and other

    62,137       57,053       48,061  

Total net sales

  $ 521,027     $ 378,316     $ 348,967  
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]
   

Geographic Location

 
   

2022

   

2021

   

2020

 

United States

  $ 381,306     $ 260,683     $ 246,913  

Foreign countries

    139,721       117,633       102,054  

Total net sales

  $ 521,027     $ 378,316     $ 348,967