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Note 5 - Revenue (Tables)
 3 Months Ended
Dec. 31, 2019
Notes Tables  
Disaggregation of Revenue [Table Text Block]
    Three Months Ended December 31,
    2019   2018
United States   $
18,240,788
     $
18,504,467
  
All other countries    
1,137,203
      
1,584,683
  
Total Net Sales   $
19,377,991
     $
20,089,150
  
    Three Months Ended December 31,
    2019   2018
Broadband Service Providers    
94
 %    
94
 %
Build-to-Print Customers    
6
 %    
6
 %
Total Net Sales    
100
 %    
100
 %