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Note 2 - Stock-based Compensation (Details) - Weighted-Average Assumptions Used for Options Granted
9 Months Ended
Sep. 30, 2014
Note 2 - Stock-based Compensation (Details) - Weighted-Average Assumptions Used for Options Granted [Line Items]  
Risk-free interest rate 0.76%
Expected volatility 106.00%
Dividend yield 0.00%
Expected option term (years) 5 years
Minimum [Member]
 
Note 2 - Stock-based Compensation (Details) - Weighted-Average Assumptions Used for Options Granted [Line Items]  
Risk-free interest rate 1.45%
Expected volatility 83.00%
Maximum [Member]
 
Note 2 - Stock-based Compensation (Details) - Weighted-Average Assumptions Used for Options Granted [Line Items]  
Risk-free interest rate 1.64%
Expected volatility 102.00%