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Note 9 - Stock-Based Compensation (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
General and Administrative Expense $ 2,131,426 $ 1,429,731 $ 1,807,605
Third Party Consulting Services [Member]      
Allocated Share-based Compensation Expense   100,000  
Expense Associated with Warrant Modifications [Member]      
General and Administrative Expense 912,862 0 277,912
2006 Equity Incentive Plan [Member]      
Allocated Share-based Compensation Expense 54,805 $ 67,905 $ 101,191
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 132,032    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 2 years 182 days