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Note 8 - Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 2023
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
   

Fair Value as of June 30, 2023

 

Assets (in thousands)

 

Level 1

   

Level 2

   

Level 3

   

Total

 

Equity securities - common stock

  $ 2,579     $ -     $ -     $ 2,579  

Interest rate swap agreements

  $ -     $ 9     $ -     $ 9