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Note 8 - Convertible Debt - Outstanding Convertible Notes (Details) - USD ($) | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Total principal amount | $ 550,000 | $ 2,430,000
Less current portion | (550,000) | (1,880,000)
Long-term debt, net of current portion |  | 550,000
The 2016 Convertible Notes [Member] |  |
Total principal amount |  | 1,880,000
Convertible Notes [Member] |  |
Total principal amount | $ 550,000 | $ 550,000

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