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Note 6 - Income Taxes - Deferred Tax Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Deferred tax assets, non-current portion: |  |
Net operating loss carryforward | $ 8,317 | $ 3,811
Intangible asset | 428 | 586
Deferral of tax deduction of R&D expense | 409 |
Less: valuation allowance | (9,154) | (4,397)
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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