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Note 18 - Fair Value of Financial Instruments (Tables)
12 Months Ended
Dec. 31, 2023
Notes Tables  
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
  

2023

  

2022

 
  

Total

  

Level 1

  

Level 2

  

Level 3

  

Total

  

Level 1

  

Level 2

  

Level 3

 

Marketable equity securities

 $43,203  $43,203   -   -  $41,728  $41,728   -   - 
Fair Value, by Balance Sheet Grouping [Table Text Block]
  

2023

  

2022

 
  

Carrying

Value

  

Estimated

Fair Value

  

Carrying

Value

  

Estimated

Fair Value

 
  

(in thousands)

 

Long-term debt

 $261,709  $251,352  $264,281  $253,762