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Note 16 - Segment and Related Information (Tables)
 12 Months Ended
Sep. 30, 2017
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
Years Ended September 30,
 
201
7
    
201
6
    
201
5
  
                         
Net Sales
 
 
 
 
  
 
 
 
  
 
 
 
Commercial Air Handling
   $
11,190,844
     $
-
     $
-
  
Test and Measurement
    
6,610,684
      
4,884,778
      
5,852,924
  
Industrial
Hose
    
6,015,207
      
1,761,002
      
-
  
    $
23,816,735
     $
6,645,780
     $
5,852,924
  
Income (Loss) Before Provision for Income Taxes
 
 
 
 
  
 
 
 
  
 
 
 
Commercial Air Handling
   $
1,424,878
     $
-
     $
-
  
Test and Measurement
    
1,859,936
      
143,021
      
940,016
  
Industrial
Hose
    
595,939
      
166,075
      
-
  
General Corporate Expenses
    
(1,691,993
 )    
1,024,152
      
(1,062,393
 )
    $
2,188,760
     $
1,333,248
     $
(122,377
 )
Revenue from External Customers by Geographic Areas [Table Text Block]
 
Years Ended September 30,
 
2017
    
2016
    
2015
  
                         
Revenue:
 
 
 
 
  
 
 
 
  
 
 
 
United States of America
   $
22,735,947
     $
6,492,423
     $
5,678,888
  
Australia
    
4,112
      
60,412
      
20,043
  
Canada
    
419,625
      
59,653
      
75,612
  
England
    
-
      
25,789
      
21,822
  
Mexico
    
315,869
      
6,976
      
26,902
  
Poland
    
316,666
      
-
      
-
  
Other
    
24,515
      
527
      
29,657
  
    $
23,816,735
     $
6,645,780
     $
5,852,924