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Note 2 - Acquisitions (Tables)
3 Months Ended
Mar. 31, 2020
Notes Tables  
Business Acquisition, Pro Forma Information [Table Text Block]
   
Three Months Ended
 
   
March 31, 2019
 
Revenue
  $
134,657
 
Net earnings
   
1,686
 
Earnings per Class A common share - basic and diluted
   
0.13
 
Earnings per Class B common share - basic and diluted
   
0.14