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Note 11 - Restructuring and Acquisition Related Expenses (Tables)
12 Months Ended
Sep. 30, 2019
Notes Tables  
Schedule of Restructuring Reserve by Type of Cost [Table Text Block]
   
Employee
Severance
and Benefits
   
Facility Closures
and Other Costs
   
Total
 
Balance at beginning of period, October 1, 2017
  $
-
    $
176
    $
176
 
Charges to operations
   
-
     
142
     
142
 
Cash disbursements
   
-
     
(226
)    
(226
)
Changes in estimates
   
-
     
(19
)    
(19
)
Accretion expense
   
-
     
5
     
5
 
Balance at end of period, September 30, 2018
   
-
     
78
     
78
 
Charges to operations
   
224
     
-
     
224
 
Cash disbursements
   
(165
)    
(54
)    
(219
)
Changes in estimates
   
-
     
(8
)    
(8
)
Accretion expense
   
-
     
-
     
-
 
Balance at end of period, September 30, 2019
  $
59
    $
16
    $
75