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Note 11 - Commitments and Contingencies (Tables)
3 Months Ended
Mar. 31, 2018
Notes Tables  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
   
Operating
Leases
 
2018 (remaining)
  $
1,094
 
2019
   
943
 
2020
   
430
 
2021
   
218
 
2022 and thereafter
   
 
Total
  $
2,685