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Note 5 - Long-term Debt (Tables)
 9 Months Ended
Sep. 30, 2017
Notes Tables  
Interest Income and Interest Expense Disclosure [Table Text Block]
   
Three Months Ended
September 30:
    
Nine Months
Ended
September 30:
  
   
2017
    
2016
    
2017
    
2016
  
Gross interest costs
   $
3,217
     $
3,413
     $
9,861
     $
10,520
  
Less: capitalized interest costs
    
(65
)
    
(74
)
    
(218
)
    
(452
)
Interest expense
    
3,152
      
3,339
      
9,643
      
10,068
  
Interest income
    
(98
)
    
(49
)
    
(421
)
    
(148
)
Interest expense, net
   $
3,054
     $
3,290
     $
9,222
     $
9,920
  
Weighted-average interest rate on Credit Facility borrowings
    
2.5
%
    
2.0
%
    
2.3
%
    
2.0
%