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Note 5 - Intangible Assets, net (Tables) | 3 Months Ended
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Mar. 31, 2019
Disclosure Text Block [Abstract] |
Schedule of Finite-Lived Intangible Assets [Table Text Block] | Intangible assets consisted of the following as of March 31, 2019 and December 31, 2018:
|  | March 31, 201 9 |  |  | December 31, 201 8 |
Customer relationship |  | $ | 6,150,559 |  |  | $ | 6,150,559 |
Trademarks |  |  | 200,000 |  |  |  | 200,000 |
Less: accumulated amortization |  |  | (2,656,331 | ) |  |  | (2,554,655 | )
|  | $ | 3,694,228 |  |  | $ | 3,795,904 |
Finite-lived Intangible Assets Amortization Expense [Table Text Block] | Estimated amortization expense relating to the existing intangible assets with finite lives for each of the next five years is as follows:
12 months ending March 31, |  |  |  |
2019 |  | $ | 406,704 |
2020 |  |  | 406,704 |
2021 |  |  | 406,704 |
2022 |  |  | 406,704 |
2023 |  |  | 406,704 |

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