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Note 11 - Marketable Securities (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Marketable Securities [Table Text Block]
   
December 31,
201
7
  
   
Amortized Cost
    
Gross Unrealized
Losses
    
Total
  
Available-for-sale:
                        
Equity securities
   $
13,072
     $
(1,136
 )   $
11,936
  
Held-to-maturity:
                        
Debt securities
    
1,329
      
-
      
1,329
  
Total marketable securities
   $
14,401
     $
(1,136
 )   $
13,265
  
   
December 31, 201
6
  
   
Amortized
Cost
    
Gross
Unrealized
Gains
    
Total
  
Available-for-sale:
                        
Equity securities
   $
6,096
     $
406
     $
6,502
  
Held-to-maturity:
                        
Debt securities
    
1,599
      
-
      
1,599
  
Total marketable securities
   $
7,695
     $
406
     $
8,101