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Note 9 - Stock-Based Compensation (Details Textual) - USD ($)
1 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2006
Non-employee Share-based Compensation [Member]          
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized   $ 0      
Incentive Stock Options (ISO's) [Member] | 2006 Equity Incentive Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent         110.00%
2006 Equity Incentive Plan [Member]          
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized   $ 95,344      
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period         10 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period         3 years
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized   1,722,529      
Allocated Share-based Compensation Expense   $ 67,905 $ 101,191 $ 143,435  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition   2 years 73 days      
Third Party Consulting Services [Member]          
Allocated Share-based Compensation Expense   $ 0 100,000 20,500  
Expense Associated with Warrant Modifications [Member]          
General and Administrative Expense $ 39,711 0 39,712 238,168  
Warrant Exercise Fee [Member]          
General and Administrative Expense     238,200    
General and Administrative Expense   $ 1,429,731 $ 1,807,605 $ 1,792,160