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Supplemental Cash Flow Information (Tables) | 12 Months Ended
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Dec. 31, 2018
Supplemental Cash Flow Elements [Abstract] |
Supplemental Cash Flow Information | The table below provides supplemental cash flow information:
| Year ended December 31,
| 2018 |  | 2017 |  | 2016
Cash paid: |  |  |  |  |  |  |  |
Income taxes | $ | 92,526 |  |  | $ | 387,159 |  |  | $ | 339,411 |
Interest | $ | 488,974 |  |  | $ | 424,547 |  |  | $ | 406,987 |
Non-cash investing and financing activities: |  |  |  |  |  |  |  |
Fixed assets under capital lease obligations | $ | 8,828 |  |  | $ | 48,378 |  |  | $ | 28,127 |

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