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Note 12 - Income Taxes (Tables)
9 Months Ended
Sep. 30, 2021
Notes Tables  
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
  

Three Months Ended

  

Nine Months Ended

 
  

September 30,

  

September 30,

 
  

2021

  

2020

  

2021

  

2020

 

Income tax expense

 $35  $43  $65  $67 

Effective income tax rate

  194%  26%  52%  26%