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Note 8 - Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Month Period Ended
    
Six Month Period Ended
  
   
June 30,
    
June 30,
  
   
201
8
    
201
7
    
201
8
    
201
7
  
Numerator:
                                
Net income (loss) attributable to common stockholders
   $
1,045,920
     $
(768,212
 )   $
943,152
     $
(1,638,502
 )
                                 
Denominator:
                                
Weighted average basic shares outstanding
    
15,180,169
      
13,100,820
      
14,642,378
      
13,033,106
  
Effect of dilutive securities
    
5,194,189
      
—
      
4,421,217
      
—
  
Weighted average diluted shares
    
20,374,358
      
13,100,820
      
19,063,595
      
13,033,106
  
                                 
Basic earnings per share
   $
0.07
     $
(0.06
)
   $
0.06
     $
(0.13
)
Diluted earnings per share
   $
0.05
     $
(0.06
)
   $
0.05
     $
(0.13
)