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Note 11 - Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2023
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
  

Fair Value as of December 31, 2023

 

Assets (Liabilities) (in thousands)

 

Level 1

  

Level 2

  

Level 3

  

Total

 

Equity securities - common stock

 $3,511  $-  $-  $3,511 

Interest rate swap agreements

  -   (199)  -   (199)