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Note 6 - Intangible Assets (Tables)
 12 Months Ended
Sep. 30, 2017
Notes Tables  
Schedule of Finite-Lived Intangible Assets [Table Text Block]
(In thousands)
  
Weighted-
Average Useful
Life (Years)
    
Gross
    
Accumulated Amortization
    
Net Book Value
  
Year ended September 30, 2017:
                                
Customer relationships
  
 
20.0
     $
6,500
     $
(1,018
 )   $
5,482
  
Developed technology and know-how
  
 
20.0
      
1,800
      
(283
 )    
1,517
  
Non-competition agreements
    
4.8
      
3,577
      
(2,663
 )    
914
  
     
 
     $
11,877
     $
(3,964
 )   $
7,913
  
                                 
Year ended October 1, 2016:
                                
Customer relationships
  
 
20.0
     $
6,500
     $
(693
 )   $
5,807
  
Developed technology and know-how
  
 
20.0
      
1,800
      
(192
 )    
1,608
  
Non-competition agreements
    
4.8
      
3,577
      
(1,929
 )    
1,648
  
     
 
     $
11,877
     $
(2,814
 )   $
9,063