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Note 3 - Supplemental Cash Flow Disclosure (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]
   
Year Ended December 31,
  
   
2018
    
2017
    
2016
  
 
  
(Dollars in thousands)
  
Cash paid for:                        
Interest, net of interest capitalized
   $
726
     $
637
     $
717
  
Income taxes
   $
30,157
     $
49,830
     $
29,144
  
                         
Non-cash investing and financing activities:
                        
Unrealized holding gains (losses) on marketable securities, net of tax
   $
(2,536
 )   $
15,204
     $
6,127