Quarterly report [Sections 13 or 15(d)]

Note 8 - Revenue - Disaggregation of Revenue (Details)

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Note 8 - Revenue - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2026
Mar. 31, 2025
Total Net Sales $ 34,391 $ 40,621 $ 68,732 $ 70,319
Total Net Sales, percentage 100.00% 100.00% 100.00% 100.00%
Broadband Service Providers [Member]        
Total Net Sales, percentage 100.00% 98.00% 100.00% 98.00%
Legacy Customers [Member]        
Total Net Sales, percentage 0.00% 2.00% 0.00% 2.00%
UNITED STATES        
Total Net Sales $ 33,892 $ 39,844 $ 66,296 $ 69,176
Non-US [Member]        
Total Net Sales $ 499 $ 777 $ 2,436 $ 1,143