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Note 12 - Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
 
 
Year Ended
December 31,
 
 
 
(Dollars in thousands)
 
2017
  $
10,104
 
2018
   
8,886
 
2019
   
7,575
 
2020
   
5,643
 
2021
   
3,910
 
Thereafter
   
4,834
 
Total rental obligations
  $
40,952