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Note 8 - Stockholders' Equity - Stock-Based Compensation Expense (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Employee Stock Option [Member]        
Stock-Based Compensation Expense $ 13,686 $ 16,926 $ 41,058 $ 50,516
Warrant [Member]        
Stock-Based Compensation Expense 15,030 484,829
Stock-Based Compensation Expense $ 28,716 $ 16,926 $ 525,887 $ 50,516