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Note 11 - Disclosures about Fair Value of Financial Instruments (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Fair Value, by Balance Sheet Grouping [Table Text Block]
(Presented in thousands)
          
2016
    
2015
  
   
Level
    
Carrying
Value
    
Fair
Value
    
Carrying
Value
   
Fair
Value
  
Financial Assets:
                                        
Cash and cash equivalents
    
1
     $
1,081
     $
1,081
     $
2,767
     $
2,767
  
Certificate of deposit – short term
    
1
      
3,370
      
3,370
      
3,324
      
3,324
  
Certificate of deposit – long term
    
1
      
720
      
720
      
1,200
      
1,200
  
     
 
     $
5,171
     $
5,171
     $
7,291
     $
7,291