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Note 16 - Segment Information (Tables)
 9 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
   
Three months ended
    
Nine months ended
  
   
June 30, 2018
    
June 30, 2018
  
                 
Revenue from external customers
                
LRAD
   $
7,012,430
     $
22,094,790
  
Genasys
    
501,638
      
916,292
  
    $
7,514,068
     $
23,011,082
  
                 
Intercompany revenues
                
LRAD
   $
-
     $
-
  
Genasys
    
96,192
      
186,010
  
    $
96,192
     $
186,010
  
                 
Segment operating income
                
LRAD
   $
(63,257
 )   $
1,507,264
  
Genasys
    
(114,870
 )    
(90,132
 )
    $
(178,127
 )   $
1,417,132
  
                 
Other expenses:
                
Depreciation and amortization expense
      
 
  
LRAD
   $
(62,665
 )   $
(187,433
 )
Genasys
    
(80,804
 )    
(149,767
 )
    $
(143,469
 )   $
(337,200
 )
                 
Interest expense
                
LRAD
   $
-
     $
-
  
Genasys
    
(4,388
 )    
(14,205
 )
    $
(4,388
 )   $
(14,205
 )
                 
Income tax expense (benefit)
                
LRAD
   $
(73,749
 )   $
2,793,590
  
Genasys
    
-
      
-
  
    $
(73,749
 )   $
2,793,590
  
   
June 30, 2018
   
September 30, 2017
 
Long-lived assets
                
LRAD
   $
538,173
     $
565,292
  
Genasys
    
4,068,429
      
-
  
    $
4,606,602
     $
565,292
  
                 
Total assets
                
LRAD
   $
35,520,401
     $
38,857,800
  
Genasys
    
5,122,533
      
-
  
    $
40,642,934
     $
38,857,800