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Note 5 - Income Taxes - Deferred Tax Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Deferred tax assets: |  |
Net operating loss carryforward | $ 7,244 | $ 8,317
Intangible asset | 329 | 428
Deferral of tax deduction of R&D expense | 1,239 | 409
Share based compensation | 1,427 |
Less: valuation allowance | (10,239) | (9,154)
Net deferred tax assets |  |

X
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- Definition Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b),(c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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