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Note 13 - Stock Option Plans (Tables)
 3 Months Ended
Dec. 31, 2019
Notes Tables  
Share-based Payment Arrangement, Option, Activity [Table Text Block]
   
Three Months Ended December 31,
  
   
201
9
    
201
8
  
   
Number
Of
Shares
    
Weighted
Average
Exercise
Price
    
Number
of
Shares
    
Weighted
Average
Exercise
Price
  
Outstanding options at the beginning of period
    
722,567
     $
8.18
      
728,867
     $
8.17
  
Options forfeited/cancelled
    
(52,400
)
    
8.07
      
(334
)
    
7.93
  
Outstanding options at the end of period
    
670,167
     $
8.19
      
728,533
     $
8.17
  
                                 
Exercisable options at the end of period
    
670,167
     $
8.19
      
728,533
     $
8.17
  
Share-based Payment Arrangement, Option, Exercise Price Range [Table Text Block]
 
 
 
 
 
  
Options Outstanding
    
Options Exercisable
  
Range of Exercise Price
    
Number
of Shares
Outstanding
    
Weighted
Remaining
Contractual
Life (in Years)
    
Weighted
Average
Exercise
Price
    
Number
of Shares
Exercisable
    
Weighted
Average
Exercise
Price
  
  $5.7501
-
$8.6250
      
560,667
      
2.7
      
7.96
      
560,667
      
7.96
  
  $8.6251
-
$11.5000
      
109,500
      
3.1
      
9.37
      
109,500
      
9.37
  
                                                 
   
 
 
      
670,167
      
2.7
     $
8.19
      
670,167
     $
8.19