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Note 8 - Leases (Tables)
 9 Months Ended
Sep. 30, 2020
Notes Tables  
Lease, Cost [Table Text Block]
   
Three Months Ended
September 30,
    
Nine Months Ended
September 30,
 
   
2020
    
2019
    
2020
   
2019
 
                                 
Operating lease cost
   $
393
     $
370
     $
1,174
     $
1,106
  
Short-term lease cost
   $
13
     $
12
     $
35
     $
39
  
Range of remaining lease terms (in years)
 
0.3
to
10.0
 
Weighted average remaining lease term (in years)
 
 
 
6.6
 
Weighted average discount rate
 
 
 
4.4%
 
Lessee, Operating Lease, Liability, Maturity [Table Text Block]
2020 (remainder)
   $
378
  
2021
    
1,407
  
2022
    
1,321
  
2023
    
1,341
  
2024
    
1,377
  
Thereafter
    
2,566
  
Total lease payments
   $
8,390
  
Less imputed interest
    
(1,042
)
Total
   $
7,348
  
Supplemental Cash Flow Infomation, Lessee [Table Text Block]
Modification to lease for facility in Fremont, California
   $
1,176
  
Modification to lease for facility in Mt. Laurel, New Jersey
   $
2,051
  
Modification to Ambrell's U.K. facility lease
   $
(486
)
Modification to lease for facility in Mansfield, Massachusetts
   $
1,811
  
Modification to Ambrell's Netherlands facility lease
   $
(48
)