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Note 10 - Mortgages and Other Financing Receivables (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
   
201
7
    
201
6
    
2015
  
Balance at January 1
,
   $
23,197
     $
23,824
     $
74,013
  
Additions:
                        
New mortgage loans
    
-
      
-
      
5,730
  
Foreign currency translation
    
385
      
397
      
-
  
Amortization of loan discounts
    
112
      
112
      
112
  
Deductions:
                        
Loan repayments
    
-
      
-
      
(53,646
 )
Charge off/foreign currency translation
    
(449
 )    
(213
 )    
(884
 )
Collections of principal
    
(1,405
 )    
(921
 )    
(1,499
 )
Amortization of loan costs
    
(2
 )    
(2
 )    
(2
 )
Balance at December 31
,
   $
21,838
     $
23,197
     $
23,824