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Note 2 - Revenue Recognition (Tables)
 6 Months Ended
Mar. 31, 2019
Notes Tables  
Disaggregation of Revenue [Table Text Block]
   
Three Months Ended March 31,
    
Six Months Ended March 31,
  
   
2019
    
2018
    
2019
    
2018
  
                                 
                                 
Wireless services revenue
   $
4,217,924
     $
‒
     $
4,217,924
     $
‒
  
Equipment sales:
                                
Wireless
    
‒
      
‒
      
‒
      
‒
  
Telco
    
8,282,486
      
6,845,571
      
14,892,128
      
12,536,891
  
Cable TV
    
3,949,929
      
4,130,486
      
8,002,068
      
9,244,777
  
Intersegment
    
(3,905
 )    
(2,130
 )    
(44,147
 )    
(2,310
 )
Telco recycle revenue
    
393,434
      
160,989
      
634,131
      
928,210
  
Cable TV repair revenue
    
433,235
      
514,612
      
843,285
      
1,226,725
  
Total revenues
   $
17,273,103
     $
11,649,528
     $
28,545,389
     $
23,934,293