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Note 8 - Summary of Stock-basedCompensation Expense (Details) - USD ($)
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Research and Development Expense [Member]    
Allocated Share-based Compensation Expense $ 242,277 $ 39,956
General and Administrative Expense [Member]    
Allocated Share-based Compensation Expense 151,194 55,900
Allocated Share-based Compensation Expense $ 393,471 $ 95,856