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Note 7 - Leases (Tables)
 6 Months Ended
Jun. 30, 2020
Notes Tables  
Lease, Cost [Table Text Block]
   
Three Months Ended
June 30,
    
Six Months Ended
June 30,
 
   
20
20
    
201
9
    
20
20
    
201
9
  
                                 
Operating lease cost
   $
389
     $
370
     $
781
     $
736
  
Short-term lease cost
   $
10
     $
14
     $
22
     $
27
  
Range of remaining lease terms (in years)
  
0.6
to
7.8
  
Weighted average remaining lease term (in years)
  
 
 
5.3
  
Weighted average discount rate
  
 
 
4.8%
  
Lessee, Operating Lease, Liability, Maturity [Table Text Block]
2020 (remainder)
   $
770
  
2021
    
1,252
  
2022
    
1,089
  
2023
    
1,106
  
2024
    
1,140
  
Thereafter
    
1,012
  
Total lease payments
   $
6,369
  
Less imputed interest
    
(749
)
Total
   $
5,620