Note 9 - Summary of Stock Options - Valuation Assumptions for Stock Options (Details)	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017
Expected term (in years) (Year)	5 years	5 years
Average volatility	76.00%	48.00%
Risk-free interest rate	2.48%	2.02%
Dividend yield	0.00%	0.00%
Nonemployees [Member]
Expected term (in years) (Year)	9 years 295 days
Average volatility	77.00%
Risk-free interest rate	2.73%
Dividend yield	0.00%

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

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- Definition

Weighted average expected volatility rate of share-based compensation awards.

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- Definition

Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809

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