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Note 12 - Other Financial Data (Tables)
 6 Months Ended
Mar. 31, 2018
Notes Tables  
Condensed Balance Sheet [Table Text Block]
   
March 31,
    
September 30,
  
(In thousands)
  
2018
    
2017
  
Accounts receivable, net:
                
Accounts receivable
   $
50,719
     $
40,485
  
Less allowance for doubtful accounts
    
(264
 )    
(201
 )
Total
   $
50,455
     $
40,284
  
                 
Inventories:
                
Raw materials
   $
34,353
     $
51,808
  
Work in process
    
3,953
      
2,637
  
Finished goods
    
24,850
      
27,408
  
Total
   $
63,156
     $
81,853
  
                 
Other current assets:
                
Prepaid insurance
   $
2,957
     $
3,796
  
Income tax receivable
    
-
      
925
  
Other
    
1,114
      
1,228
  
Total
   $
4,071
     $
5,949
  
                 
Other assets:
                
Cash surrender value of life insurance policies
   $
9,425
     $
9,026
  
Capitalized financing costs, net
    
73
      
105
  
Other
    
151
      
203
  
Total
   $
9,649
     $
9,334
  
                 
Property, plant and equipment, net:
                
Land and land improvements
   $
14,428
     $
12,177
  
Buildings
    
53,991
      
50,373
  
Machinery and equipment
    
156,352
      
153,484
  
Construction in progress
    
6,388
      
5,641
  
     
231,159
      
221,675
  
Less accumulated depreciation
    
(127,882
 )    
(123,005
 )
Total
   $
103,277
     $
98,670
  
                 
Accrued expenses:
                
Salaries, wages and related expenses
   $
3,524
     $
5,520
  
Customer rebates
    
776
      
1,015
  
Property taxes
    
524
      
1,384
  
Workers' compensation
    
115
      
116
  
Other
    
558
      
632
  
Total
   $
5,497
     $
8,667
  
                 
Other liabilities:
                
Deferred compensation
   $
10,704
     $
9,276
  
Deferred income taxes
    
5,833
      
8,103
  
Total
   $
16,537
     $
17,379