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Note 4 - Loss Per Share (Tables)
3 Months Ended
Mar. 31, 2017
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
    Three Months Ended March 31,
    2017   2016
Numerator:                
Net loss available in basic and diluted calculation   $
(1,341,847
)   $
(2,176,369
)
Other comprehensive income:                
Unrealized gain from marketable securities    
-
     
2,850
 
Comprehensive (loss)    
(1,341,847
)    
(2,173,519
)
Denominator:                
Weighted average common shares outstanding-basic    
6,450,967
     
723,848
 
                 
Effect of diluted stock options, warrants and preferred stock (1)    
-
     
-
 
                 
Weighted average common shares outstanding-basic    
6,450,967
     
723,848
 
                 
Loss per common share-basic and diluted   $
(0.21
)   $
(3.01
)