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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]
2018
  $
1,778
 
2019
   
1,638
 
2020
   
1,592
 
2021
   
844
 
2022
   
291
 
Thereafter
   
1,739
 
Total   $
7,882