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Note 11 - Convertible Notes Payable (Tables) | 9 Months Ended
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Sep. 30, 2019
Notes Tables |
Convertible Debt [Table Text Block] |
Principal amount |  | $ | 3,060,000 |
Less unamortized debt discount |  |  | (856,888 | )
Less unamortized debt issuance costs |  |  | (343,477 | )
Notes payable, net of unamortized debt discount and debt issuance costs |  | $ | 1,859,635 |

X
- Definition Tabular disclosure of borrowings which can be exchanged for a specified number of another security at the option of the issuer or the holder. Disclosures include, but are not limited to, principal amount, amortized premium or discount, and amount of liability and equity components. + References No definition available. + Details
Name: | us-gaap_ConvertibleDebtTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_TableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration