Quarterly report pursuant to Section 13 or 15(d)

Note 5 - Revenue - Disaggregation of Revenue (Details)

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Note 5 - Revenue - Disaggregation of Revenue (Details) - USD ($)
3 Months Ended 6 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Total Net Sales $ 20,408,509 $ 19,084,365 $ 39,786,500 $ 39,173,515
Percent of net sales 100.00% 100.00% 100.00% 100.00%
Broadband Service Providers [Member]        
Percent of net sales 96.00% 94.00% 95.00% 94.00%
Build-to-print Customers [Member]        
Percent of net sales 4.00% 6.00% 5.00% 6.00%
UNITED STATES        
Total Net Sales $ 19,489,270 $ 17,136,328 $ 37,731,957 $ 35,640,795
Non-US [Member]        
Total Net Sales $ 919,239 $ 1,948,037 $ 2,054,543 $ 3,532,720