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Note 13 - Commitments and Contingencies (Tables)
9 Months Ended
Sep. 30, 2018
Notes Tables  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
Year Ending December 31,
 
Amount
 
2018
  $
745
 
2019
   
                                  2,981
 
2020
   
                                  2,922
 
2021
   
                                  2,544
 
2022
   
                                  2,496
 
2023 and beyond
   
                                     214
 
Total future minimum lease payments
  $
11,902