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Note 18 - Fair Value of Financial Instruments (Tables)
12 Months Ended
Dec. 31, 2020
Notes Tables  
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
  

2020

  

2019

 
                                 
  

Total

  

Level 1

  

Level 2

  

Level 3

  

Total

  

Level 1

  

Level 2

  

Level 3

 

Marketable equity securities

 $27,9417,549  $27,941   -   -  $29,521  $29,521   -   - 
Fair Value, by Balance Sheet Grouping [Table Text Block]
  

2020

  

2019

 
  

Carrying

Value

  

Estimated

Fair Value

  

Carrying

Value

  

Estimated

Fair Value

 
  

(in thousands)

 

Long-term debt

 $267,860  $268,582  $224,777  $228,449