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Note 13 - Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
2019
   $
1,511
  
2020
    
872
  
2021
    
273
  
2022
    
195
  
2023
    
26
  
Total
   $
2,877
  
Schedule of Product Warranty Liability [Table Text Block]
   
Year Ended December 31,
  
   
2018
    
2017
    
2016
  
Balance at beginning of period
   $
2,416
     $
1,030
     $
289
  
Warranty provision for product sales
    
6,586
      
1,912
      
1,102
  
Settlements made
    
(1,402
 )    
(40
 )    
(68
 )
Unused warranty provision
    
(3,036
 )    
(486
 )    
(293
 )
Balance at end of period
   $
4,564
     $
2,416
     $
1,030