Note 4 - Inventory

Reserves for inventory obsolescence are recorded as necessary to reduce obsolete inventory to estimated net realizable value or to specifically reserve for obsolete inventory. Sales of previously reserved inventory net of write-downs and write-offs for the three and nine months ended September 30, 2024 were $0 and $14,904, respectively. Sales of previously reserved inventory net of write-downs and write-offs for the three and nine months ended September 30, 2023 were $(88,306) and $(22,978), respectively.