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Depreciation and Amortization (Tables) | 9 Months Ended
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Sep. 30, 2019
Depreciation And Amortization [Abstract] |
Depreciation and Amortization Expense Excluded from Operating Expenses in its Statements of Income and Comprehensive Income | The amounts of depreciation and amortization expense excluded from the following operating expenses in its Statements of Income and Comprehensive Income are:
|  | Three months ended September 30, |  |  | Nine months ended September 30, |
|  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
Direct advertising expenses |  | $ | 59,556 |  |  | $ | 51,360 |  |  | $ | 175,871 |  |  | $ | 155,832 |
General and administrative expenses |  |  | 942 |  |  |  | 927 |  |  |  | 3,203 |  |  |  | 2,935 |
Corporate expenses |  |  | 3,453 |  |  |  | 2,802 |  |  |  | 8,076 |  |  |  | 8,484 |
|  | $ | 63,951 |  |  | $ | 55,089 |  |  | $ | 187,150 |  |  | $ | 167,251 |

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