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Note 4 - Investments (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Equity Method Investments [Table Text Block]
As of and for the year ended December 31
, (in thousands)
  
2017
    
201
6
  
Revenues
   $
2,188
     $
2,050
  
Operating loss
    
(152
 )    
(168
 )
Net
loss
    
(152
 )    
(168
 )
As of and for the year ended December 31,
(in thousands)
  
2017
    
201
6
  
Current assets
   $
115
     $
107
  
Non-current assets
    
3,005
      
3,002
  
Current liabilities
    
563
      
400
  
Stockholders
’ equity
    
2,557
      
2,709
  
Equity Method Investments [Member]  
Notes Tables  
Equity Method Investments [Table Text Block]
   
Carrying Value
  
At December 31,
(in thousands)
  
2017
    
201
6
  
NKD Enterprises, LLC
   $
25
     $
64