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Allowance for Doubtful Accounts
 12 Months Ended
Dec. 31, 2016
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, 2016 and 2015:
 
 
2016
 
2015
Balance at the beginning of the year
$
17,200

 
$
86,722

Provision for bad debts
6,557

 
(6,036
)
Charge-offs
(874
)
 
(67,126
)
Recoveries
117

 
3,640

Balance at the end of the year
$
23,000

 
$
17,200