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Note 4 - Real Property and Other Income, Expense (Tables)
12 Months Ended
Dec. 31, 2023
Notes Tables  
Schedule of Other Nonoperating Income (Expense) [Table Text Block]
  

Years ended December 31,

 
  

2023

  

2022

  

2021

 
             

Lease revenue

 $2,283  $2,459  $911 

Property operating expenses

  (1,376)  (1,462)  (477)

Other income, net

 $907  $997  $434