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Note 4 - Investments (Tables)
 6 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Available-for-sale Securities Reconciliation [Table Text Block]
   
June 30,
    
December 31,
  
   
2018
    
2017
  
Cost basis
   $
543,000
     $
543,000
  
Gains previously recognized on warrants
    
380,000
      
380,000
  
Loss included in accumulated other comprehensive loss or reclassified to retained earnings on Jaunuary 1, 2018
    
(580,000
 )    
(580,000
 )
Unrealized loss recognized in earnings since January 1, 2018
    
(65,000
 )    
-
  
Fair value
   $
278,000
     $
343,000