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Note 8 - Convertible Debt (Tables) | 12 Months Ended
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Dec. 31, 2017
Notes Tables |
Convertible Debt [Table Text Block] |
|  | December 31, |
|  | 2017 |  |  | 2016 |
2016 convertible notes |  | $ | — |  |  | $ | 1,880,000 |
Pre-Merger convertible notes |  |  | 550,000 |  |  |  | 550,000 |
|  |  | 550,000 |  |  |  | 2,430,000 |
Less current portion |  |  | (550,000 | ) |  |  | (1,880,000 | )
Long-term debt, net of current portion |  | $ | — |  |  | $ | 550,000 |

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