Quarterly report pursuant to Section 13 or 15(d)

Note 8 - Summary of Stock Options - Summary of Option Activity Under All Plans (Details)

v3.7.0.1
Note 8 - Summary of Stock Options - Summary of Option Activity Under All Plans (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Options outstanding, Shares (in shares) 1,909,764  
Options outstanding, Weighted average exercise price (in dollars per share) $ 6.19  
Options outstanding, weighted average remaining contractual term (Year) 8 years 357 days 9 years 43 days
Options outstanding, Aggregate Intrinsic Value $ 1,832,711,000 $ 211,396
Options granted, Shares (in shares) 229,860  
Options granted, Weighted average exercise price (in dollars per share) $ 4.46  
Options exercised, Shares (in shares)  
Options exercised, Weighted average exercise price (in dollars per share)  
Options canceled, Shares (in shares) (5,410)  
Options canceled, Weighted average exercise price (in dollars per share) $ 6.38  
Options outstanding, Shares (in shares) 2,134,214 1,909,764
Options outstanding, Weighted average exercise priceod (in dollars per share) $ 6 $ 6.19
Vested and exercisable and expected to vest, end of period, Number Of Shares (in shares) 1,980,152  
Vested and exercisable and expected to vest, end of period, Weighted Average Exercise Price (in dollars per share) $ 6.03  
Vested and exercisable and expected to vest, end of period, Weighted Average Remaining Contractual Term (Year) 8 years 343 days  
Vested and exercisable and expected to vest, end of period, Aggregate Intrinsic Value $ 1,692,844,000  
Vested and exercisable, end of period, Number Of Shares (in shares) 501,273  
Vested and exercisable, end of period, Weighted Average Exercise Price (in dollars per share) $ 7.06  
Vested and exercisable, end of period, Weighted Average Remaining Contractual Term (Year) 8 years 18 days  
Vested and exercisable, end of period, Aggregate Intrinsic Value $ 419,952,000