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Note 10 - Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
Years Ending December
 31,
 
 
 
 
         
2018
  $
9,076
 
2019
   
5,737
 
2020
   
4,719
 
2021
   
3,523
 
2022
   
3,498
 
Thereafter
   
2,487
 
    $
29,040