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Note 11 - Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
Year Ending December 31,
 
Amount
 
2019
  $
3,011
 
2020
   
2,939
 
2021
   
2,564
 
2022
   
2,495
 
2023 and thereafter
   
214
 
Future minimum rental payments
  $
11,223
 
Schedule of Future Minimum Lease Payments for Capital Leases [Table Text Block]
Year Ending December 31,
 
Amount
 
2019
  $
576
 
2020
   
287
 
2021
   
152
 
Future minimum lease payments
  $
1,015