Note 1  Organization and Summary of Significant Accounting Policies  Assumptions Used to Calculate Fair Value of Stock Option Awards Granted (Details) 
12 Months Ended  

Dec. 31, 2017 
Dec. 31, 2016 
Dec. 31, 2015 

Expected volatility  66.00%  59.00%  61.00% 
Expected volatility  79.00%  75.00%  64.00% 
Weightedaverage volatility  75.00%  60.00%  62.00% 
Expected dividends  
Riskfree rate  1.80%  1.20%  1.50% 
Riskfree rate  2.10%  1.80%  1.90% 
Minimum [Member]  
Expected term (Year)  5 years  5 years  5 years 36 days 
Maximum [Member]  
Expected term (Year)  6 years  6 years  6 years 109 days 
X  
 Definition 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. Reference 1: http://www.xbrl.org/2003/role/presentationRef

X  
 Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probabilityweighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef

X  
 Definition The estimated measure of the maximum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probabilityweighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. No definition available.

X  
 Definition The estimated measure of the minimum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probabilityweighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. No definition available.

X  
 Definition The maximum riskfree interest rate assumption that is used in valuing an option on its own shares. No definition available.

X  
 Definition The minimum riskfree interest rate assumption that is used in valuing an option on its own shares. No definition available.

X  
 Definition Expected term of sharebased compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef

X  
 Details

X  
 Details
