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 9 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Total Net Sales $ 25,970,045 $ 21,892,244 $ 65,756,545 $ 61,065,759
Percent of net sales 100.00% 100.00% 100.00% 100.00%
Broadband Service Providers [Member]        
Percent of net sales 97.00% 97.00% 96.00% 95.00%
Build-to-print Customers [Member]        
Percent of net sales 3.00% 3.00% 4.00% 5.00%
UNITED STATES        
Total Net Sales $ 25,090,614 $ 20,243,754 $ 62,765,455 $ 55,861,025
Non-US [Member]        
Total Net Sales $ 879,431 $ 1,648,490 $ 2,991,090 $ 5,204,734