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Note 10 - Taxes (Tables)
3 Months Ended
Mar. 31, 2021
Notes Tables  
Summary of Income Tax Examinations [Table Text Block]
  

Earliest Exam Year

Taxing Authority Jurisdiction:

  

U.S. Federal

 

2017

China 2017

Various U.S. States

 

2016

Puerto Rico (U.S. Territory)

 

2015

Canada

 

2015