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Note 3 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value (USD $)
Sep. 30, 2014
Dec. 31, 2013
Dec. 31, 2012
Note 3 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value [Line Items]      
Total assets $ 190 $ 324 $ 503
Preferred stock warrant liabilities   623,672 685,213
Total liabilities   623,672 685,213
Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member]
      
Note 3 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value [Line Items]      
Money market fund 190 324 503
Fair Value, Inputs, Level 1 [Member]
      
Note 3 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value [Line Items]      
Total assets 190 324 503
Fair Value, Inputs, Level 3 [Member]
      
Note 3 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value [Line Items]      
Preferred stock warrant liabilities   623,672 685,213
Total liabilities   623,672 685,213
Money Market Funds [Member]
      
Note 3 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value [Line Items]      
Money market fund $ 190 $ 324 $ 503