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Inventories - Excess and slow-moving inventory (Details) - USD ($)
Sep. 30, 2025
Jun. 30, 2025
Excess and slow-moving inventory and net realizable value reserve    
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]    
Reserve for excess and slow-moving inventory $ 5,281,000 $ 5,515,000