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Note 9 - Operating Leases (Tables)
9 Months Ended
Sep. 29, 2019
Notes Tables  
Lease, Cost [Table Text Block]
   
Three Months Ended
   
Nine
Months Ended
 
   
September 29,
2019
   
September 30,
2018
   
September 29,
2019
   
September 30,
2018
 
Operating lease cost
  $
168
    $
145
    $
459
    $
445
 
Variable lease cost
   
21
     
21
     
63
     
69
 
Total lease cost
  $
189
    $
166
    $
522
    $
514
 
Lessee, Lease, Cash Flow Information [Table Text Block]
   
Nine
Months Ended
 
   
September 29
,
2019
   
September 30
,
2018
 
Cash paid for amounts included in the measurement of lease liabilities:
               
Operating cash flows from operating leases
  $
447
    $
457
 
Right-of-use assets obtained in exchange for lease liabilities:
  $
1,586
    $
-
 
Lessee, Lease, Balance Sheet Information [Table Text Block]
   
Balance Sheet Classification
 
September 29
,
2019
   
December 31,
2018
 
Assets:
                   
Operating lease right-of-use asset
 
Other noncurrent assets
  $
1,989
    $
805
 
                     
Liabilities:
                   
Current operating lease liability
 
Accrued expenses and other current liabilities
  $
600
    $
439
 
Operating lease liability, net of current portion
 
Other noncurrent liabilities
   
1,387
     
376
 
Total operating lease liability  
 
  $
1,987
    $
815
 
                     
Weighted-average remaining lease term (years)  
 
   
3.9
     
2.1
 
                     
Weighted-average discount rate  
 
   
4.5
%    
4.5
%
Lessee, Operating Lease, Liability, Maturity [Table Text Block]
Maturity of Operating Lease Liabilities
 
 
 
 
2019
  $
163
 
2020
   
673
 
2021
   
459
 
2022
   
347
 
2023
   
356
 
Thereafter
   
178
 
Total lease payments
   
2,176
 
Less: Imputed interest
   
(189
)
Present value of remaining lease payments
  $
1,987