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Note 7 - Other Income and Loss (Tables)
12 Months Ended
Dec. 31, 2020
Notes Tables  
Schedule of Other Nonoperating Income (Expense) [Table Text Block]
   
Year Ended December 31,
 
   
2020
   
2019
 
Interest income
  $
24
    $
179
 
Other income (loss)
   
(59
)    
(30
)
Total income (loss)
  $
(35
)   $
149