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Note 7 - Non-operating Income (Tables)
9 Months Ended
Sep. 30, 2021
Notes Tables  
Schedule of Other Nonoperating Income, by Component [Table Text Block]
  

Three Months Ended

September 30

  

Nine Months Ended

September 30

 
  

2021

  

2020

  

2021

  

2020

 

Equity in earnings of unconsolidated investments

 $14  $3,019  $5,320  $8,448 

Dividends and net realized gains on sales of securities

  2,365   2,084   6,242   5,997 

Interest income

  1,020   1,375   3,683   4,425 

Total non-operating income

 $3,399  $6,478  $15,245  $18,870