Note 9 - Summary of Stock Options - Valuation Assumptions for Stock Options (Details)	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Expected term (Year)	5 years	5 years	5 years	5 years
Average volatility	69.00%	48.00%	75.00%	48.00%
Risk-free interest rate	2.82%	1.76%	2.63%	1.90%
Dividend yield	0.00%	0.00%	0.00%	0.00%
Nonemployees [Member]
Expected term (Year)	10 years	10 years	10 years	10 years
Average volatility	91.00%	55.00%	91.00%	55.00%
Risk-free interest rate	2.85%	2.00%	2.85%	2.29%
Dividend yield	0.00%	0.00%	0.00%	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.

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-Name Accounting Standards Codification
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