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Allowance for Doubtful Accounts
12 Months Ended
Dec. 31, 2017
Allowance for Doubtful Accounts [Abstract]  
Allowance for Doubtful Accounts
Allowance for Doubtful Accounts
 
The activity in the allowance for doubtful accounts was as follows during the years ended December 31, 2017 and 2016:
 
 
2017
 
2016
Balance at the beginning of the year
$
23,000

 
$
17,200

Provision for bad debts
63,000

 
6,557

Charge-offs
(2,211
)
 
(874
)
Recoveries

 
117

Balance at the end of the year
$
83,789

 
$
23,000