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Note 1 - Nature of the Business (Details) (USD $)
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12 Months Ended | ||
|---|---|---|---|
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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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| Disclosure Text Block [Abstract] | |||
| Net Income (Loss) Attributable to Parent | $ (30,712,000) | $ (11,149,000) | $ (21,194,000) |
| Net Cash Provided by (Used in) Operating Activities, Continuing Operations | (26,230,000) | (13,206,000) | (18,836,000) |
| Cash, Cash Equivalents, and Short-term Investments | $ 22,700,000 | $ 48,100,000 | |