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Note 9 - Stock-Based Compensation - Allocation of Stock Option Expense (Details) - USD ($)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Employee Stock Option [Member] | General and Administrative Expense [Member]      
Allocated stock option expense $ 69,057 $ 101,896 $ 231,936
Employee Stock Option [Member] | Research and Development Expense [Member]      
Allocated stock option expense 32,134 41,539 78,140
Employee Stock Option [Member]      
Allocated stock option expense $ 101,191 $ 143,435 $ 310,076