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Note 5 - Stockholders' Equity - Stock Options Issued Outside of the 2007 Equity Incentive Plan by Exercise Price Range (Details) - $ / shares
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Options Outstanding (in shares) 30,065,352    
Outside of the 2007 Plan [Member]      
Options Outstanding (in shares) 20,148,766 19,394,975 17,965,291
Weighted Average Remaining Contractual Life (Year) 4 years    
Weighted Average Exercise Price (in dollars per share) $ 0.40    
Currently Exercisable, Number Of Shares (in shares) 19,998,766    
Currently Exercisable, Weighted Average Exercise Price (in dollars per share) $ 0.40    
Exercise Price Range, Lower Limit (in dollars per share) 0.18    
Exercise Price Range, Upper Limit (in dollars per share) $ 1    
Outside of the 2007 Plan [Member] | Exercise Price Range 1 [Member]      
Options Outstanding (in shares) 7,733,259    
Weighted Average Remaining Contractual Life (Year) 91 days    
Weighted Average Exercise Price (in dollars per share) $ 0.18    
Currently Exercisable, Number Of Shares (in shares) 7,733,259    
Currently Exercisable, Weighted Average Exercise Price (in dollars per share) $ 0.18    
Outside of the 2007 Plan [Member] | Exercise Price Range 2 [Member]      
Options Outstanding (in shares) 2,400,000    
Weighted Average Remaining Contractual Life (Year) 91 days    
Weighted Average Exercise Price (in dollars per share) $ 0.99    
Currently Exercisable, Number Of Shares (in shares) 2,400,000    
Currently Exercisable, Weighted Average Exercise Price (in dollars per share) $ 0.99    
Outside of the 2007 Plan [Member] | Exercise Price Range 3 [Member]      
Options Outstanding (in shares) 691,975    
Weighted Average Remaining Contractual Life (Year) 2 years    
Weighted Average Exercise Price (in dollars per share) $ 0.55    
Currently Exercisable, Number Of Shares (in shares) 691,975    
Currently Exercisable, Weighted Average Exercise Price (in dollars per share) $ 0.55    
Outside of the 2007 Plan [Member] | Exercise Price Range 4 [Member]      
Options Outstanding (in shares) 800,000    
Weighted Average Remaining Contractual Life (Year) 5 years    
Weighted Average Exercise Price (in dollars per share) $ 1    
Currently Exercisable, Number Of Shares (in shares) 800,000    
Currently Exercisable, Weighted Average Exercise Price (in dollars per share) $ 1    
Outside of the 2007 Plan [Member] | Exercise Price Range 5 [Member]      
Options Outstanding (in shares) 168,750    
Weighted Average Remaining Contractual Life (Year) 6 years    
Weighted Average Exercise Price (in dollars per share) $ 0.40    
Currently Exercisable, Number Of Shares (in shares) 168,750    
Currently Exercisable, Weighted Average Exercise Price (in dollars per share) $ 0.40    
Outside of the 2007 Plan [Member] | Exercise Price Range 6 [Member]      
Options Outstanding (in shares) 1,497,986    
Weighted Average Remaining Contractual Life (Year) 6 years    
Weighted Average Exercise Price (in dollars per share) $ 0.30    
Currently Exercisable, Number Of Shares (in shares) 1,497,986    
Currently Exercisable, Weighted Average Exercise Price (in dollars per share) $ 0.30    
Outside of the 2007 Plan [Member] | Exercise Price Range 7 [Member]      
Options Outstanding (in shares) 3,122,093    
Weighted Average Remaining Contractual Life (Year) 7 years    
Weighted Average Exercise Price (in dollars per share) $ 0.32    
Currently Exercisable, Number Of Shares (in shares) 3,122,093    
Currently Exercisable, Weighted Average Exercise Price (in dollars per share) $ 0.32    
Exercise Price Range, Lower Limit (in dollars per share) 0.25    
Exercise Price Range, Upper Limit (in dollars per share) $ 0.65    
Outside of the 2007 Plan [Member] | Exercise Price Range 8 [Member]      
Options Outstanding (in shares) 2,120,947    
Weighted Average Remaining Contractual Life (Year) 8 years    
Weighted Average Exercise Price (in dollars per share) $ 0.37    
Currently Exercisable, Number Of Shares (in shares) 2,120,947    
Currently Exercisable, Weighted Average Exercise Price (in dollars per share) $ 0.37    
Exercise Price Range, Lower Limit (in dollars per share) 0.33    
Exercise Price Range, Upper Limit (in dollars per share) $ 0.47    
Outside of the 2007 Plan [Member] | Exercise Price Range 9 [Member]      
Options Outstanding (in shares) 1,388,166    
Weighted Average Remaining Contractual Life (Year) 9 years    
Weighted Average Exercise Price (in dollars per share) $ 0.47    
Currently Exercisable, Number Of Shares (in shares) 1,238,116    
Currently Exercisable, Weighted Average Exercise Price (in dollars per share) $ 0.47    
Exercise Price Range, Lower Limit (in dollars per share) 0.33    
Exercise Price Range, Upper Limit (in dollars per share) $ 0.65    
Outside of the 2007 Plan [Member] | Exercise Price Range 10 [Member]      
Options Outstanding (in shares) 225,641    
Weighted Average Remaining Contractual Life (Year) 10 years    
Weighted Average Exercise Price (in dollars per share) $ 0.76    
Currently Exercisable, Number Of Shares (in shares) 225,641    
Currently Exercisable, Weighted Average Exercise Price (in dollars per share) $ 0.76    
Exercise Price Range, Lower Limit (in dollars per share) 0.60    
Exercise Price Range, Upper Limit (in dollars per share) $ 0.83