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Note 10 - Stockholders' Equity (Details) - Assumptions used to calculate the fair values of stock options (Minimum [Member])
9 Months Ended
Sep. 30, 2013
Minimum [Member]
 
Note 10 - Stockholders' Equity (Details) - Assumptions used to calculate the fair values of stock options [Line Items]  
Expected term (Years) 4 years
Volatility 40.74%
Risk free interest rate 0.67%
Dividend yield 0.00%