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Note 4 - Balance Sheet Details (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Note 4 - Balance Sheet Details (Details) [Line Items] |  |  |
Depreciation | $ 578,000 us-gaap_Depreciation | $ 333,000 us-gaap_Depreciation | $ 197,000 us-gaap_Depreciation
Asset Impairment Charges | 905,000 us-gaap_AssetImpairmentCharges |  |
Equipment [Member] |  |  |
Note 4 - Balance Sheet Details (Details) [Line Items] |  |  |
Asset Impairment Charges | 905,000 us-gaap_AssetImpairmentCharges / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_EquipmentMember |  |
Assets Held-for-sale, Long Lived, Fair Value Disclosure | $ 115,000 us-gaap_AssetsHeldForSaleLongLivedFairValueDisclosure / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_EquipmentMember |  |

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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2420-110228 + Details
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- Definition Fair value portion of assets classified as held for sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19190-110258 + Details
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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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