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Note 3 - Property, Plant and Equipment - Depreciation of Property, Plant, and Equipment (Details)
Sep. 30, 2023
Minimum [Member] | Machinery and Equipment [Member]  
Plant and buildings (Year) 5 years
Minimum [Member] | Furniture and Fixtures [Member]  
Plant and buildings (Year) 3 years
Minimum [Member] | Property, Plant and Equipment [Member]  
Plant and buildings (Year) 20 years
Maximum [Member] | Machinery and Equipment [Member]  
Plant and buildings (Year) 15 years
Maximum [Member] | Furniture and Fixtures [Member]  
Plant and buildings (Year) 5 years
Maximum [Member] | Property, Plant and Equipment [Member]  
Plant and buildings (Year) 30 years