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Note 18 - Fair Value of Financial Instruments (Tables)
12 Months Ended
Dec. 31, 2022
Notes Tables  
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
  

2022

  

2021

 
                                 
  

Total

  

Level 1

  

Level 2

  

Level 3

  

Total

  

Level 1

  

Level 2

  

Level 3

 
                                 

Marketable equity securities

 $41,728  $41,728   -   -  $39,424  $39,424   -   - 
Fair Value, by Balance Sheet Grouping [Table Text Block]
  

2022

  

2021

 
  

Carrying
Value

  

Estimated
Fair Value

  

Carrying
Value

  

Estimated
Fair Value

 
  

(in thousands)

 

Long-term debt

 $264,281  $253,762  $222,277  $224,191