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Note 8 - Long-term Debt (Tables)
12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Debt [Table Text Block]
    December 31,
2016
     
Revolving credit facility   $
96,688
 
3.84% Notes    
150,000
 
Capital leases maturing at various dates through 2021    
1,188
 
Other long-term debt maturing at various dates up to 2023    
3,033
 
     
250,909
 
Less: current portion    
1,043
 
Long-term debt - non-current   $
249,866
 
Schedule of Maturities of Long-term Debt [Table Text Block]
2017   $
1,043
 
2018    
795
 
2019    
547
 
2020    
97,237
 
2021 and thereafter    
151,287