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Note 17 - Fair Value of Financial Instruments (Tables)
12 Months Ended
Dec. 31, 2017
Notes Tables  
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
   
Total
   
Level 1
   
Level 2
   
Level 3
 
   
(in thousands)
 
Marketable equity securities
  $
26,664
    $
26,664
     
-
     
-
 
Fair Value, by Balance Sheet Grouping [Table Text Block]
   
201
7
   
201
6
 
   
Carrying
Value
   
Estimated
Fair Value
   
Carrying
Value
   
Estimated
Fair Value
 
   
(in thousands)
 
Long-term debt
  $
172,636
    $
171,289
    $
165,331
    $
163,975