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Revenue and Accounts Receivable (FY) (Tables)
 12 Months Ended
Dec. 31, 2019
Revenue and Accounts Receivable [Abstract]  
Accounts Receivable Components
The components of accounts receivable are as follows (in thousands):

 
December 31,
 
  
2019
  
2018
 
Billed accounts receivable
 
$
11,917
  
$
18,848
 
Unbilled receivables
  
16,745
   
16,000
 
Allowance for doubtful accounts
  
(720
)
  
(306
)
Total
 
$
27,942
  
$
34,542
 
Allowance for Doubtful Accounts
The activities in the allowance for doubtful accounts are set forth below (in thousands):

 
Balance Beginning
of Year
  
Bad Debt
Expenses (1)
  
Recoveries (2)
  
Balance
End
of Year
 
             
Year ended December 31, 2019
 
$
306
  
$
414
  
$
--
  
$
720
 
Year ended December 31, 2018
 
$
411
  
$
(105
)
 
$
--
  
$
306
 
Year ended December 31, 2017
 
$
429
  
$
(18
)
 
$
--
  
$
411
 

(1)
Accounts receivable reserves and reversal of allowance for subsequent collections, net
(2)
Accounts receivable written-off and subsequent recoveries, net
Revenue by Customer Sector
We derived a substantial portion of our revenues from contracts and subcontracts with the U.S. Government. Revenue by customer sector for the last three fiscal years is as follows:

 
2019
  
2018
  
2017
 
        
(dollar amounts in thousands)
       
                   
Federal
 
$
149,257
   
93.7
%
 
$
129,279
   
93.7
%
 
$
101,519
   
94.2
%
State & Local, and Commercial
  
9,961
   
6.3
%
  
8,737
   
6.3
%
  
6,208
   
5.8
%
Total
 
$
159,218
   
100.0
%
 
$
138,016
   
100.0
%
 
$
107,727
   
100.0
%