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Note 3 - Stock-Based Compensation (Details) - Fair Value of Options
9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Fair Value of Options [Abstract]    
Volatility    19.10%
Expected option life (in years)    3 years
Interest rate (risk free)    0.80%
Dividends 0.00% 0.00%