Annual report pursuant to section 13 and 15(d)

Note 8 - Stockholders' Equity (Details) - Summary of Stock Options

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Note 8 - Stockholders' Equity (Details) - Summary of Stock Options (USD $)
 12 Months Ended
Dec. 31, 2013
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options Outstanding - Number Outstanding (in Shares) 7,430,225
Options Outstanding - Weighted-Average Remaining Contractual Life 7 years 288 days
Options Outstanding - Weighted-Average Exercise Price $ 1.47
Options Exercisable - Number Exercisable (in Shares) 4,416,292
Options Exercisable - Weighted-Average Remaining Contractual Life 7 years 14 days
Options Exercisable - Weighted-Average Exercise Price $ 1.68
Range 1 [Member]
  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, Lower Range $ 0.88
Range of Exercise Prices, Upper Range $ 1.26
Options Outstanding - Number Outstanding (in Shares) 3,375,650
Options Outstanding - Weighted-Average Remaining Contractual Life 7 years 113 days
Options Outstanding - Weighted-Average Exercise Price $ 1.01
Options Exercisable - Number Exercisable (in Shares) 1,189,384
Options Exercisable - Weighted-Average Remaining Contractual Life 6 years 131 days
Options Exercisable - Weighted-Average Exercise Price $ 0.97
Range 2 [Member]
  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, Lower Range $ 1.40
Range of Exercise Prices, Upper Range $ 2.13
Options Outstanding - Number Outstanding (in Shares) 3,948,450
Options Outstanding - Weighted-Average Remaining Contractual Life 8 years 105 days
Options Outstanding - Weighted-Average Exercise Price $ 1.74
Options Exercisable - Number Exercisable (in Shares) 3,120,783
Options Exercisable - Weighted-Average Remaining Contractual Life 7 years 146 days
Options Exercisable - Weighted-Average Exercise Price $ 1.79
Range 3 [Member]
  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, Lower Range $ 3.20
Range of Exercise Prices, Upper Range $ 9.64
Options Outstanding - Number Outstanding (in Shares) 106,125
Options Outstanding - Weighted-Average Remaining Contractual Life 4 years 62 days
Options Outstanding - Weighted-Average Exercise Price $ 6.16
Options Exercisable - Number Exercisable (in Shares) 106,125
Options Exercisable - Weighted-Average Remaining Contractual Life 4 years 62 days
Options Exercisable - Weighted-Average Exercise Price $ 6.16