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Note 11 - Marketable Securities (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Marketable Securities [Table Text Block]
   
December 31, 2018
    
December 31, 2017
  
Available-for-sale:
                
Equity securities
   $
9,045
     $
11,936
  
Held-to-maturity:
                
Debt securities
    
1,257
      
1,329
  
Total marketable securities
   $
10,302
     $
13,265