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Note 6 - Marketable Securities (Tables)
12 Months Ended
Dec. 31, 2018
Notes Tables  
Debt Securities, Available-for-sale [Table Text Block]
   
 
 
 
 
Gross Unrealized
   
 
 
 
   
Amortized
Cost
   
Gains
   
Losses
   
 
Estimated
Fair Value
 
As of December 31, 2018
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Marketable securities, current
                               
Mortgage securities
  $
-
    $
-
    $
-
    $
-
 
Equity securities
   
2
     
-
     
(1
)    
1
 
Total
  $
2
    $
-
    $
(1
)   $
1
 
                                 
As of
December 31, 2017
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Marketable securities, current
                               
Mortgage securities
  $
400
    $
11,394
    $
-
    $
11,794
 
Equity securities
   
1
     
-
     
-
     
1
 
Total
  $
401
    $
11,394
    $
-
    $
11,795
 
Schedule of Variable Interest Entities [Table Text Block]
   
Size/Principal Outstanding (A)
   
Assets on Balance Sheet (B)
   
Liabilities on Balance Sheet
   
Maximum Exposure to Loss
   
Year to Date Loss on Sale
   
Year to Date Cash Flows
 
December 31, 2018
  $
-
    $
-
    $
-
    $
-
    $
-
    $
1,057
 
December 31, 2017
  $
2,714,823
    $
11,794
    $
-
    $
11,794
    $
-
    $
3,193