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Note 5 - Income Taxes (Tables)
6 Months Ended
Jun. 30, 2021
Notes Tables  
Schedule of Income Tax Provisions and Rates [Table Text Block]
  

Three months ended

  

Six months ended

 
  

June 30,

  

June 30,

 
  

2021

  

2020

  

2021

  

2020

 

Provision for income taxes

 $(67) $(22) $(293) $(10)

Effective tax rate

  13.0%  (44.9%)  21.8%  (6.4%)