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Note 10 - Stock-based Compensation (Tables)
 6 Months Ended
Mar. 31, 2020
Notes Tables  
Share-based Payment Arrangement, Option, Activity [Table Text Block]
   
 
Shares
    
Wtd. Avg.
Ex. Price
    
Aggregate
Intrinsic Value
  
Outstanding at September 30, 2019
    
770,000
     $
1.73
     $
352,700
  
Granted
    
‒
      
‒
      
‒
  
Exercised
    
(110,000
 )   $
1.57
     $
282,833
  
Expired
    
–
      
–
      
–
  
Forfeited
    
(116,667
 )   $
1.31
     $
130,667
  
Outstanding at March 31, 2020
    
543,333
     $
1.85
     $
394,266
  
                         
Exercisable at March 31, 2020
    
410,001
     $
1.98
     $
265,334
  
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
   
Six Months Ended
March 31, 2020
  
Fiscal year 2017 grant
   $
4,784
  
Fiscal year 2019 grants
   $
2,744