Annual report pursuant to Section 13 and 15(d)

Note 4 - Concentrations - Disaggregation of Revenue (Details)

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Note 4 - Concentrations - Disaggregation of Revenue (Details) - USD ($)
12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Total Net Sales $ 93,074,514 $ 85,034,182
Percent of net sales 100.00% 100.00%
Broadband Service Providers [Member]    
Percent of net sales 96.00% 95.00%
Build-to-print Customers [Member]    
Percent of net sales 4.00% 5.00%
Revenue Benchmark [Member] | Geographic Concentration Risk [Member] | UNITED STATES    
Total Net Sales $ 89,021,000 $ 78,553,000
Revenue Benchmark [Member] | Geographic Concentration Risk [Member] | Non-US [Member]    
Total Net Sales $ 4,054,000 $ 6,481,000