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Note 12 - Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
Year Ended
 
Amount
 
         
201
8
  $
3,735
 
201
9
   
3,540
 
2020
   
3,464
 
20
21
   
2,219
 
20
22
   
2,104
 
Thereafter
   
15,441
 
Total
  $
30,503