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Note 6 - Prepaid Expenses and Other Current Assets (Details) - Prepaid Expenses and Other Current Assets - USD ($) | Sep. 30, 2015 | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | --- | ---
Prepaid Expenses and Other Current Assets [Abstract] |  |  |  |
Prepaid insurance |  | $ 116,243 |  | $ 152,812
Prepaid - other |  | 46,471 |  | 68,906
Vendor deposits |  | 117,352 |  | 95,792
| $ 80,061 | $ 280,066 | [1] | $ 317,510
[1] | The condensed consolidated balance sheet as of December 31, 2014 has been derived from the audited consolidated financial statements as of that date.

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