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Note 4 - Subordinated Secured Notes Receivable (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
   
2018
    
2017
  
   
Principal
Balance
    
Discount
    
Balance
    
Principal
Balance
    
Discount
    
Balance
  
A&R Note
  
$
3,376
   
$
(1,012
)
  
$
2,364
     
-
      
-
      
-
  
S&L Note
  
 
4,340
   
 
(822
)
  
 
3,518
     
-
      
-
      
-
  
   
$
7,716
   
$
(1,834
)
  
$
5,882
     
-
      
-
      
-