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Note 5 - Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2018
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months Ended
    
Nine Months Ended
  
   
September 30,
    
September 30,
  
   
2018
    
2017
    
2018
    
2017
  
Net (loss) income
   $
(121,534
 )   $
521,414
     $
2,592,177
     $
2,780,411
  
Numerator for basic and diluted earnings per share
   $
(121,534
 )    
521,414
      
2,592,177
      
2,780,411
  
                                 
Denominator for basic EPS: weighted-average shares
    
9,154,209
      
9,270,862
      
9,199,173
      
9,232,397
  
                                 
Effect of dilutive securities:
                                
Stock options
    
-
      
-
      
-
      
9,810
  
Restricted stock
    
822
      
3,088
      
786
      
3,859
  
Dilutive potential common shares
    
822
      
3,088
      
786
      
13,669
  
Denominator for diluted EPS-weighted-average shares
    
9,155,031
      
9,273,950
      
9,199,959
      
9,246,066
  
                                 
Basic (loss) earnings per share
   $
(0.01
 )   $
0.06
     $
0.28
     $
0.30
  
Diluted (loss) earnings per share
   $
(0.01
 )   $
0.06
     $
0.28
     $
0.30