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Note 2 - Revenue Recognition (Tables)
 9 Months Ended
Jun. 30, 2020
Notes Tables  
Disaggregation of Revenue [Table Text Block]
   
Three Months Ended June 30,
    
Nine Months Ended June 30,
  
   
2020
    
2019
    
2020
    
2019
  
                                 
Wireless services sales
   $
5,123,176
     $
8,733,444
     $
16,592,907
     $
12,951,368
  
Equipment sales:
                                
Telco
    
6,147,676
      
7,989,318
      
19,912,137
      
22,876,047
  
Intersegment
    
(23,033
 )    
(5,305
 )    
(23,033
 )    
(49,452
 )
Telco repair sales
    
33,236
      
31,142
      
49,438
      
36,542
  
Telco recycle sales
    
740,765
      
810,716
      
1,411,854
      
1,444,847
  
Total sales
   $
12,021,820
     $
17,559,315
     $
37,943,303
     $
37,259,352