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Note 5 - Intangible Assets (Tables)
 6 Months Ended
Mar. 31, 2017
Notes Tables  
Schedule of Finite-Lived Intangible Assets [Table Text Block]
Intangible Assets
 
   
March 31, 2017
    
September 30, 2016
  
   
Customer Relationships
    
Developed Technology
    
Total
    
Customer Relationships
    
Developed Technology
    
Total
  
                                                 
Gross intangibles
   $
21,950,000
     $
2,525,000
     $
24,475,000
     $
22,104,000
     $
2,525,000
     $
24,629,000
  
Accumulated
amortization
    
(16,979,000
 )    
(1,990,000
 )    
(18,969,000
 )    
(14,938,000
 )    
(1,738,000
 )    
(16,676,000
 )
    $
4,971,000
     $
535,000
     $
5,506,000
     $
7,166,000
     $
787,000
     $
7,953,000