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Note 4 - Subordinated Notes Receivable (Tables)
 12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
   
Principal
    
Discount
    
Balance
  
Balance at January 1, 2018
   $
-
     $
-
     $
-
  
New borrowings on subordinated note receivables
    
7,421
      
(2,607
 )    
4,814
  
Interest paid-in-kind
    
337
      
-
      
337
  
Extinguishment of debt
    
(4,400
 )    
1,330
      
(3,070
 )
Capitalized legal fees
    
18
      
-
      
18
  
Accretion of discount
    
-
      
265
      
265
  
Balance at December 31, 2018
   $
3,376
     $
(1,012
 )   $
2,364
  
Principal payments
  
 
(812
)
  
 
-
    
 
(812
)
Impairment
  
 
-
   
 
(897
)
  
 
(897
)
Accretion of discount
  
 
-
    
 
54
    
 
54
  
Balance at December 31, 2019
  
$
2,564
    
$
(1,855
)
  
$
709
  
   
Principal
    
Discount
    
Balance
  
Balance at January 1, 2018
   $
-
     $
-
     $
-
  
New borrowings on subordinated note receivables
    
4,400
      
(884
 )    
3,516
  
Principal payments
    
(60
 )    
-
      
(60
 )
Accretion of discount
    
-
      
62
      
62
  
Balance at December 31, 2018
   $
4,340
     $
(822
 )   $
3,518
  
Principal payments
  
 
(1,011
)
  
 
-
    
 
(1,011
)
Accretion of discount
  
 
-
    
 
163
    
 
163
  
Balance at December 31, 2019
  
$
3,329
    
$
(659
)
  
$
2,670