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Note 5 - Revenue (Tables)
 6 Months Ended
Mar. 31, 2020
Notes Tables  
Disaggregation of Revenue [Table Text Block]
    Three Months Ended March 31,   Six Months Ended March 31,
    2020   2019   2020   2019
United States   $
19,489,270
     $
17,136,328
     $
37,731,957
     $
35,640,795
  
All other countries    
919,239
      
1,948,037
      
2,054,543
      
3,532,720
  
Total Net Sales   $
20,408,509
     $
19,084,365
     $
39,786,500
     $
39,173,515
  
    Three Months Ended March 31,   Six Months Ended March 31,
    2020   2019   2020   2019
Broadband service providers    
96
 %    
94
 %    
95
 %    
94
 %
Build-to-print customers    
4
 %    
6
 %    
5
 %    
6
 %
Total Net Sales    
100
 %    
100
 %    
100
 %    
100
 %