Note 13 - Net Income (Loss) Per Share (Tables)
 6 Months Ended
Mar. 31, 2020
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
For the Three
Months Ended
March 31,
2020
    
For the Three
Months Ended
March 31,
2019
    
For the Six
Months Ended
March 31,
2020
    
For the Six
Months Ended
March 31,
2019
  
Net Income (Loss)
   $
(72,000
)
   $
1,773,000
     $
973,000
     $
3,048,000
  
                                 
Basic earnings (loss) per common share
   $
(0.01
)
   $
0.27
     $
0.15
      
0.46
  
                                 
Diluted earnings per common share
   $
(0.01
)
   $
0.27
     $
0.15
      
0.46
  
                                 
Weighted average number of common shares outstanding:
                                
Basic
    
6,567,765
      
6,685,415
      
6,567,765
      
6,685,415
  
Dilutive effect of stock options
  
––
      
412
      
87,108
      
360
  
Diluted
    
6,567,765
      
6,685,827
      
6,654,873
      
6,685,775