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Note 11 - Marketable Securities
 12 Months Ended
Dec. 31, 2017
Notes to Financial Statements  
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block]
11.
Marketable Securities
:
   
The amortized cost and
gross unrealized gains/(losses) of securities available-for-sale and held-to-maturity at
December 31, 2017
and
2016,
are as follows (in thousands):
 
   
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
  
 
During
2017,
the Company acquired available-for-sale marketable equity securities for an aggregate purchase price of
$9.8
million.
 
 
During
2015,
the Company received
$76.2
million in proceeds from the sale or redemption of certain marketable securities and recognized
$39.9
million of realizable gains.
 
As of
December 31,
2017,
the contractual maturities of debt securities classified as held-to-maturity are within the next
five
years. Actual maturities
may
differ from contractual maturities as issuers
may
have the right to prepay debt obligations with or without prepayment penalties.