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Note 17 - Fair Value of Financial Instruments (Tables)
12 Months Ended
Dec. 31, 2016
Notes Tables  
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
 
 
Total
 
 
Level 1
 
 
Level 2
 
 
Level 3
 
 
 
(in thousands)
 
Marketable equity securities
  $
27,621
    $
27,621
     
-
     
-
 
Fair Value, by Balance Sheet Grouping [Table Text Block]
 
 
2016
 
 
2015
 
 
 
Carrying
Value
 
 
Estimated Fair
Value
 
 
Carrying
Value
 
 
Estimated Fair
Value
 
 
 
(in thousands)
 
Long-term debt
  $
165,331
    $
163,975
    $
129,271
    $
129,024