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Note 16 - Revenues
 3 Months Ended
Mar. 31, 2020
Notes to Financial Statements  
Revenue from Contract with Customer [Text Block]
16.
Revenues
The following table represents a disaggregation of revenue from contracts with customers. Revenue originating from the following geographic areas for the
three
months ended
March 31, 2020
and
2019
consist of:
 
    Three Months Ended March 31, 2020
    (in thousands)
    United
States		   United
Kingdom		   Germany   Rest of the
world		   Total
Instruments, equipment, software and accessories   $
15,956
     $
2,507
     $
2,573
     $
1,901
     $
22,937
  
Service, maintenance and warranty contracts    
575
      
204
      
39
      
16
      
834
  
Total revenues   $
16,531
     $
2,711
     $
2,612
     $
1,917
     $
23,771
  
 
    Three Months Ended March 31, 2019
    (in thousands)
    United
States		   United
Kingdom		   Germany   Rest of the
world		   Total
Instruments, equipment, software and accessories   $
18,671
     $
3,129
     $
2,913
     $
2,044
     $
26,757
  
Service, maintenance and warranty contracts    
1,143
      
190
      
97
      
15
      
1,445
  
Total revenues   $
19,814
     $
3,319
     $
3,010
     $
2,059
     $
28,202
  
 
Deferred revenue
 
The Company had approximately
$3.7
million in deferred revenue from service contracts and advance payments as of
March 31, 2020
and
2019,
respectively. Changes in deferred revenue from service contracts and advance payments from customers during the period were as follows:
 
    Three Months Ended March 31, 2020
    (in thousands)
    Service
Contracts		   Customer
Advances		   Total
Balance, beginning of period   $
1,587
     $
2,362
     $
3,949
  
Deferral of revenue    
308
      
223
      
531
  
Recognition of deferred revenue    
(499
 )    
(322
 )    
(821
 )
Effect of foreign currency translation    
14
      
-
      
14
  
Balance, end of period   $
1,410
     $
2,263
     $
3,673
  
 
    Three Months Ended March 31, 2019
    (in thousands)
    Service
Contracts		   Customer
Advances		   Total
Balance, beginning of period   $
1,659
     $
2,161
     $
3,820
  
Deferral of revenue    
845
      
111
      
956
  
Recognition of deferred revenue    
(848
 )    
(223
 )    
(1,071
 )
Effect of foreign currency translation    
10
      
-
      
10
  
Balance, end of period   $
1,666
     $
2,049
     $
3,715
  
 
Allowance for Doubtful Accounts
 
Allowance for doubtful accounts is based on the Company’s assessment of the collectability of accounts receivable. A rollforward of allowance for doubtful accounts is as follows:
 
    Three Months Ended March 31,
    2020   2019
    (in thousands)
Balance, beginning of period   $
325
     $
332
  
Bad debt expense    
4
      
348
  
Charge-offs and other recoveries    
(31
 )    
(337
 )
Effect of foreign currency translation    
(1
 )    
(2
 )
Balance, end of period   $
297
     $
341
  
 
Concentrations
 
No
customer accounted for more than
10%
of the revenues for the
three
months ended
March 31, 2020,
and
2019.
At
March 31, 2020,
and
2019,
no
customer accounted for more than
10%
of net accounts receivable.