Quarterly report pursuant to Section 13 or 15(d)

Note 4 - Stock Plans and Stock Based Compensation - Black-Scholes Valuation Model Assumptions (Details)

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Note 4 - Stock Plans and Stock Based Compensation - Black-Scholes Valuation Model Assumptions (Details) - $ / shares
 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Employee Stock Option [Member]    
Weighted-average fair value per share (in dollars per share)   $ 2.88
Risk -free interest rate (1) [1]   1.91%
Expected volatility of stock (2) [2]   61.84%
Dividend yield  
Expected option life (3) (years) [3]   6 years
Director Stock Options [Member]    
Weighted-average fair value per share (in dollars per share) $ 2.84 $ 2.73
Risk -free interest rate (1) [1] 2.21% 2.63%
Expected volatility of stock (2) [2] 57.98% 59.59%
Dividend yield
Expected option life (3) (years) [3] 10 years 10 years
[1] The risk-free interest rate is based on the U.S. Treasury yield in effect at the grant date over the expected term of the option.
[2] The expected volatility is based on historical volatility from our traded Common Stock over the expected term of the option.
[3] The expected option life is based on historical exercises and post-vesting data.