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Note 9 - Segment Reporting (Tables)
 6 Months Ended
Mar. 31, 2017
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
   
Three Months Ended
    
Six Months Ended
  
   
March 31,
2017
    
March 31,
2016
    
March 31,
2017
    
March 31,
2016
  
Sales
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Cable TV
   $
4,996,965
     $
6,018,891
     $
11,571,790
     $
11,023,888
  
Telco
    
6,363,466
      
4,601,172
      
11,903,442
      
7,918,903
  
Intercompany
    
(65,675
 )    
(32,876
 )    
(84,650
 )    
(105,936
 )
Total sales
   $
11,294,756
     $
10,587,187
     $
23,390,582
     $
18,836,855
  
                                 
Gross profit
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Cable TV
   $
1,755,059
     $
1,906,675
     $
4,155,401
     $
3,485,946
  
Telco
    
2,009,370
      
1,677,937
      
3,632,657
      
2,864,046
  
Total gross profit
   $
3,764,429
     $
3,584,612
     $
7,788,058
     $
6,349,992
  
                                 
Income (loss) from operations
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Cable TV
   $
262,648
     $
336,279
     $
1,171,631
     $
453,119
  
Telco
    
(175,644
 )    
(8,070
 )    
(657,822
 )    
(28,155
 )
Total income from operations
   $
87,004
     $
328,209
     $
513,809
     $
424,964
  
   
March 31,
2017
    
September 30,
2016
                  
Segment assets
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Cable TV
   $
24,283,621
     $
25,201,697
                  
Telco
    
24,075,143
      
15,122,911
                  
Non-allocated
    
7,012,686
      
9,943,551
                  
Total assets
   $
55,371,450
     $
50,268,159