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Note 12 - Stock-based Compensation (Tables)
 9 Months Ended
Jun. 30, 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
    
(123,334
 )   $
1.20
     $
304,568
  
Expired
    
–
      
–
      
–
  
Forfeited
    
(166,666
 )   $
1.35
     $
347,999
  
Outstanding at June 30, 2020
    
480,000
     $
1.89
     $
742,800
  
                         
Exercisable at June 30, 2020
    
376,667
     $
1.99
     $
546,101
  
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
   
Nine Months Ended
June 30, 2020
  
Fiscal year 2017 grant
   $
(5,652
 )
Fiscal year 2019 grants
   $
(1,476
 )