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Schedule II - Valuation and Qualifying Accounts (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Summary of Valuation Allowance [Table Text Block]
Column A
  
Column B
    
Column C
    
Column D
    
Column E
  
           
Additions
                  
Description
  
Balance–
Beginning
of Period
    
Charged to
Costs and
Expenses
    
Charged
to other
Accounts
    
Deductions
    
Balance–
End of
Period
  
For the year ended December 31, 2016
                                        
Accrued risk reserves
   $
98,508
     $
63,596
     $
−
     $
70,942
     $
91,162
  
                                         
For the year ended December 31, 2017
                                        
Accrued risk reserves
   $
91,162
     $
71,229
     $
−
     $
69,116
     $
93,275
  
                                         
For the year ended December 31, 2018
                                        
Accrued risk reserves
   $
93,275
     $
75,052
     $
−
     $
72,303
     $
96,024