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Note 5 - Intangible Assets (Tables)
 6 Months Ended
Mar. 31, 2018
Notes Tables  
Schedule of Finite-Lived Intangible Assets [Table Text Block]
(In thousands)
  
Gross Amount
    
Accumulated
Amortization
    
Net Book Value
  
As of March 31, 2018:
                        
Customer relationships
   $
9,070
     $
(1,293
 )   $
7,777
  
Developed technology and know-how
    
1,800
      
(326
 )    
1,474
  
Non-competition agreements
    
3,687
      
(2,789
 )    
898
  
Trade name
    
140
      
(14
 )    
126
  
    $
14,697
     $
(4,422
 )   $
10,275
  
                         
As of September 30, 2017:
                        
Customer relationships
   $
6,500
     $
(1,018
 )   $
5,482
  
Developed technology and know-how
    
1,800
      
(283
 )    
1,517
  
Non-competition agreements
    
3,577
      
(2,663
 )    
914
  
    $
11,877
     $
(3,964
 )   $
7,913