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, 2021
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Total Net Sales $ 29,691,934 $ 20,408,509 $ 56,784,081 $ 39,786,500
Percent of net sales 100.00% 100.00% 100.00% 100.00%
Broadband Service Providers [Member]        
Percent of net sales 97.00% 96.00% 98.00% 95.00%
Legacy Customers [Member]        
Percent of net sales 3.00% 4.00% 2.00% 5.00%
UNITED STATES        
Total Net Sales $ 27,743,937 $ 19,489,270 $ 53,776,138 $ 37,731,957
Non-US [Member]        
Total Net Sales $ 1,947,997 $ 919,239 $ 3,007,943 $ 2,054,543