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Schedule II - Valuation and Qualifying Accounts (Tables)
 12 Months Ended
Dec. 31, 2019
Notes Tables  
Valuation Allowances and Reserves [Table Text Block]
 
 
 
Description
  
Balance at
Beginning of
Period
    
Charged to
(deducted
from) Costs
and Expenses
    
Balance at End
of Period
  
Year ended December 31, 2017:
Allowance for doubtful accounts
Sales returns reserve
    
-
      
-
      
-
  
Year ended December 31, 2018:
Allowance for doubtful accounts
Sales returns reserve
    
-
      
-
      
-
  
Year ended December 31, 2019:
Allowance for doubtful accounts
Sales returns reserve
    
-
      
-
      
-