Annual report [Section 13 and 15(d), not S-K Item 405]

Note 7 - Concentrations - Disaggregation of Revenue (Details)

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Note 7 - Concentrations - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Net sales $ 150,134 $ 125,568 $ 225,722
Percent of net sales 100.00% 100.00% 100.00%
Broadband Service Providers [Member]      
Percent of net sales 98.00% 98.00% 99.00%
Legacy Customers [Member]      
Percent of net sales 2.00% 2.00% 1.00%
Revenue Benchmark [Member] | Geographic Concentration Risk [Member]      
Net sales $ 150,134 $ 125,568 $ 225,722
UNITED STATES | Revenue Benchmark [Member] | Geographic Concentration Risk [Member]      
Net sales 144,895 122,483 218,835
Non-US [Member] | Revenue Benchmark [Member] | Geographic Concentration Risk [Member]      
Net sales $ 5,239 $ 3,085 $ 6,887