Annual report pursuant to Section 13 and 15(d)

Note 1 - Organization and Summary of Significant Accounting Policies (Tables)

v3.19.1
Note 1 - Organization and Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
   
2018
   
2017
 
Expected volatility
 
64%
-
76%
   
66%
-
79%
 
Weighted-average volatility
 
69%
   
75%
 
Expected dividends
 
   
 
Expected term (in years)
 
5.5
-
6.0
   
5.0
-
6.0
 
Risk-free rate
 
2.6%
-
2.7%
   
1.8%
-
2.1%