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Note 17 - Fair Value of Financial Instruments (Tables)
12 Months Ended
Dec. 31, 2015
Notes Tables  
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
 
 
Total
 
 
Level 1
 
 
Level 2
 
 
Level 3
 
 
 
(in thousands)
 
Marketable equity securities
  $ 24,575     $ 24,575       -       -  
Fair Value, by Balance Sheet Grouping [Table Text Block]
 
 
2015
 
 
2014
 
 
 
Carrying
Value
 
 
Estimated
Fair Value
 
 
Carrying
Value
 
 
Estimated
Fair Value
 
 
 
(in thousands)
 
Long-term debt
  $ 129,271     $ 129,024     $ 95,201     $ 95,326