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Note 14 - Subsequent Event (Details Textual) - USD ($)
1 Months Ended 2 Months Ended 12 Months Ended
Feb. 15, 2016
Oct. 31, 2014
May. 30, 2013
Jan. 17, 2013
Feb. 28, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Subsequent Event [Member] | Series C Convertible Preferred Stock [Member]                
Common stock conversion (in shares)         1,400,000      
Subsequent Event [Member] | Series E Warrants [Member]                
Class of Warrant or Right, Exercise Fee $ 0.02916              
Class of Warrant or Right, Exercised During Period 3,664,588              
Proceeds from Warrant Exercises $ 238,198              
General and Administrative Expense $ 469,800              
Proceeds from Warrant Exercises   $ 873,400 $ 583,333 $ 1,060,000        
General and Administrative Expense           $ 1,429,731 $ 1,807,605 $ 1,792,160