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Note 6 - Prepaid Expenses and Other Receivables (Tables) | 9 Months Ended
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Sep. 30, 2019
Other Income and Expenses [Abstract] |
Schedule of Other Current Assets [Table Text Block] | Prepaid expenses and other receivables consisted of the following at September 30, 2019 and December 31, 2018:
|  | September 30, 2019 |  |  | December 31, 2018 |
Prepaid expenses |  | $ | 234,260 |  |  | $ | 96,197 |
Other receivables |  |  | 146,453 |  |  |  | 9,615 |
Total |  | $ | 380,713 |  |  | $ | 105,812 |

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- Definition Tabular disclosure of the carrying amounts of other current assets. + References No definition available. + Details
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