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Note 8 - Leases (Tables)
6 Months Ended
Jun. 30, 2019
Notes Tables  
Lease, Cost [Table Text Block]
   
As of
June 30, 2019
 
Operating leases:
       
Operating lease right-of-use assets
  $
1,190
 
Operating lease liabilities
  $
1,190
 
   
Three months ended
June 30, 2019
   
Six months ended
June 30, 2019
 
Operating lease cost
  $
80
    $
146
 
Short-term lease expense
  $
15
    $
31
 
   
As of
June 30, 2019
 
Weighted-average remaining lease term for operating leases (in years)
   
11.1
 
Weighted-average discount rate for operating leases
   
2.74
%
Lessee, Operating Lease, Liability, Maturity [Table Text Block]
June 30, 2019
 
Operating Leases
 
         
2019 (remaining)
  $
140
 
2020
   
180
 
2021
   
157
 
2022
   
157
 
2023
   
116
 
After 2023
   
641
 
Total lease payments
   
1,391
 
Less: Imputed Interest
   
(201
)
Total operating leases
  $
1,190