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Note 11 - Stock Compensation (Tables)
 3 Months Ended
Dec. 31, 2017
Notes Tables  
Share-based Compensation, Stock Options, Activity [Table Text Block]
   
Three Months
December 31,
2017
    
Weighted 
Average
Exercise Price
    
Fiscal Year
September 30,
2017
    
Weighted 
Average 
Exercise Price
    
Fiscal Year
September 30,
2016
    
 
Weighted 
Average
Exercise Price
    
Fiscal Year
September 30,
2015
    
Weighted 
Average
Exercise 
Price
 
Option Shares
 
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Directors Plans:
 
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Outstanding beginning of the period
    
5,000
     $
3.54
      
5,000
     $
3.54
      
6,000
     $
3.44
      
22,000
     $
5.3
  
Granted
    
-
      
-
      
-
      
-
      
-
      
-
      
-
      
-
  
Canceled/expired
    
-
     $
-
      
-
     $
-
      
(1,000
)
   $
2.925
      
(16,000
)
   $
6
  
Exercised
    
-
      
-
      
-
      
-
      
-
      
-
      
-
      
-
  
Outstanding end of the period
    
5,000
     $
3.54
      
5,000
     $
3.54
      
5,000
     $
3.54
      
6,000
     $
3.44
  
Exercisable end of the period
    
5,000
     $
3.54
      
5,000
     $
3.54
      
5,000
     $
3.54
      
6,000
     $
3.44
  
Directors Plans [Member]  
Notes Tables  
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]
Directors Plans
    
Outstanding
Stock
Options
    
Weighted
Average
Exercise Price
    
Weighted
Average
Remaining
Life
    
Number of
Stock
Options
Exercisable
    
Weighted
Average
Exercise
Price
  
Range of exercise prices:
      
 
      
 
      
 
      
 
      
 
  
$
2.925
      
4,000
     $
2.925
      
3.9
      
4,000
     $
2.925
  
$
6.00
      
1,000
     $
6.000
      
2.1
      
1,000
     $
6.000
  
 
 
      
5,000
     $
3.540
      
 
      
5,000
     $
3.540