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Note 2 - Net Income Per Share (Tables)
 3 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
    Three Months Ended December 31,
    2019   2018
Net income   $
501,158
     $
1,009,960
  
Weighted average common shares    
13,512,094
      
13,400,383
  
Dilutive potential common shares    
110,132
      
-
  
Weighted average dilutive common shares outstanding    
13,622,226
      
13,400,383
  
Net income per common share:                
Basic   $
0.04
     $
0.08
  
Diluted   $
0.04
     $
0.08