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Note 12 - Income Taxes (Tables)
3 Months Ended
Mar. 31, 2021
Notes Tables  
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
   

Three Months Ended March 31,

 
   

2021

   

2020

 

Income tax expense

  $ 15     $ 18  

Effective income tax rate

    28 %     25 %