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Note 9 - Stock-Based Compensation (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
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           110,235      
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                 1,200,000
Allocated Share-based Compensation Expense           $ 101,191 $ 143,435 $ 310,076  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition           1 year 328 days      
Third Party Consulting Services [Member]                  
Allocated Share-based Compensation Expense           $ 100,000 20,500 0  
Expense Associated with Warrant Modifications [Member]                  
General and Administrative Expense $ 39,711         39,712 238,168 0  
Warrant Exercise Fee [Member]                  
General and Administrative Expense           238,200      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized   $ 64,330   $ 64,330          
Allocated Share-based Compensation Expense   16,926 $ 24,573 $ 50,516 $ 165,638        
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition       1 year 182 days          
General and Administrative Expense   $ 335,932 $ 411,814 $ 1,102,262 $ 1,128,478 $ 1,807,605 $ 1,792,160 $ 1,752,765