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QUALIFYING ACCOUNTS (Tables) | 12 Months Ended
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Dec. 31, 2017
QUALIFYING ACCOUNTS |
Schedule of valuation and qualifying accounts |
|  |  |  | Additions |  |  |  |  |
|  | Balance at |  | Charged to |  | Charged to |  |  |  | Balance |
|  | Beginning |  | Costs and |  | other account |  | Deductions |  | at end |
Description |  | of Period |  | Expenses |  | describe |  | Describe(a) |  | of Period |
Year Ended December 31, 2017: |  |  |  |  |  |  |  |  |  |  |
Deducted from asset accounts: |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | 523,004 |  | 422,109 |  |  |  | 301,123 |  | 643,990 |
Year Ended December 31, 2016: |  |  |  |  |  |  |  |  |  |  |
Deducted from asset accounts: |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | 372,828 |  | 365,746 |  |  |  | 215,570 |  | 523,004 |
Year Ended December 31, 2015: |  |  |  |  |  |  |  |  |  |  |
Deducted from asset accounts: |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | 366,105 |  | 201,622 |  |  |  | 194,899 |  | 372,828 |
| (a) |  | Uncollectible accounts written off

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- Definition Tabular disclosure of the schedule of allowance and reserve accounts including their beginning and ending balances, as well as a reconciliation by type of activity during the period. + References No definition available. + Details
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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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