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Schedule II - Valuation and Qualifying Accounts (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Summary of Valuation Allowance [Table Text Block]
   
Balance at
    
Additions Charged to
    
Impact of
 
  
Balance
  
 
  
Beginning
    
Costs and
    
Other
    
Tax Cuts
 
  
at End
  
Year ended December 31,
2017
  
of Period
    
Expenses
    
Accounts
    
and Jobs Act
    
of Period
  
                                         
Deferred tax asset valuation allowance
   $
87,626
     $
9,486
     $
-
     $
(30,675
)
   $
66,437
  
                                         
Year ended
December 31,
2016
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
                                         
Deferred tax asset valuation allowance
   $
80,505
     $
7,121
     $
-
     $
-
     $
87,626
  
                                         
Year ended
December 31,
2015
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
                                         
Deferred tax asset valuation allowance
   $
71,939
     $
8,566
     $
-
     $
-
     $
80,505