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Note 7 - Concentrations - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Net sales | $ 268,720 | $ 270,883 | $ 140,755
Percent of net sales | 100.00% | 100.00% | 100.00%
Broadband Service Providers [Member] |  |  |
Percent of net sales | 97.00% | 99.00% | 98.00%
Legacy Customers [Member] |  |  |
Percent of net sales | 3.00% | 1.00% | 2.00%
Revenue Benchmark [Member] | Geographic Concentration Risk [Member] |  |  |
Net sales | $ 268,720 | $ 270,883 | $ 140,755
UNITED STATES | Revenue Benchmark [Member] | Geographic Concentration Risk [Member] |  |  |
Net sales | 218,835 | 255,607 | 131,285
Non-US [Member] | Revenue Benchmark [Member] | Geographic Concentration Risk [Member] |  |  |
Net sales | $ 49,885 | $ 15,276 | $ 9,470

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