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Note 6 - Share Capital (Details) - Shares Underlying Outstanding Warrants Classified as Liabilities and Equity
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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|---|---|---|---|
| Class of Warrant or Right [Line Items] | |||
| Shares underlying warrants outstanding classified as | 8,230,848 | 10,922,090 | 5,922,090 |
| Warrants Outstanding Classified as Liabilities [Member] | |||
| Class of Warrant or Right [Line Items] | |||
| Shares underlying warrants outstanding classified as | 3,182,147 | 5,873,389 | |
| Warrants Classified as Equity [Member] | |||
| Class of Warrant or Right [Line Items] | |||
| Shares underlying warrants outstanding classified as | 5,048,701 | 5,048,701 |