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Note 9 - Convertible Debt (Tables) | 12 Months Ended
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Dec. 31, 2016
Notes Tables |
Convertible Debt [Table Text Block] |
Convertible Note Series |  | Issue Date |  | Maturity Date |  | Conversion Price |  |  | Interest Rate |  |  | Total Principal |
2016 Convertible Notes |  | 9/27/2016 |  | 9/27/2017 |  | $ | 3.50 |  |  |  | 6.00 | % |  | $ | 1,880,000 |
Series B Note |  | 3/15/2011 |  | 6/30/2018 |  | $ | 2.74 |  |  |  | 1.00 | % |  |  | 550,000 |
Total principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,430,000 |
Less current portion of convertible notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,880,000 | )
Convertible notes, net of current portion |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 550,000 |
Convertible Note Series |  | Issue Date |  | Maturity Date |  | Conversion Price |  |  | Interest Rate |  |  | Total Principal |
B |  | 3/15/2011 |  | 6/30/2018 |  | $ | 2.74 |  |  |  | 1.00 | % |  |  | 570,000 |
C |  | 09/14/12 |  | 6/30/2018 |  | $ | 2.74 |  |  |  | 1.00 | % |  |  | 425,000 |
E |  | 06/30/2014 |  | 06/30/2018 |  | $ | 4.11 |  |  |  | 1.00 | % |  |  | 50,000 |
F |  | 12/04/2015 |  | 12/04/2019 |  | $ | 5.48 |  |  |  | 1.00 | % |  |  | 200,000 |
Total principal amount |  |  |  |  |  |  |  |  |  |  | 1,245,000 |
Less: unamortized debt issuance costs |  |  |  |  |  |  |  |  |  |  | (1,390 | )
Less current portion of convertible notes |  |  |  |  |  |  |  |  |  |  | (424,964 | )
Convertible notes, net of current portion |  |  |  |  |  |  |  |  |  | $ | 818,646 |

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