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v3.20.4

QUALIFYING ACCOUNTS (Tables) | 12 Months Ended
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Dec. 31, 2020
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, 2020: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Deducted from asset accounts: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Allowance for doubtful accounts |  | 240,111 | ​ | 1,846,237 | ​ | ​ | ​ | 632,653 | ​ | 1,453,695 | ​
Year Ended December 31, 2019: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Deducted from asset accounts: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Allowance for doubtful accounts |  | 532,161 | ​ | 445,909 | ​ | ​ | ​ | 737,959 | ​ | 240,111 | ​
Year Ended December 31, 2018: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Deducted from asset accounts: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Allowance for doubtful accounts |  | 643,990 | ​ | 357,789 | ​ | ​ | ​ | 469,618 | ​ | 532,161 | ​
(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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