Note 1 - Operations and Summary of Significant Accounting Policies - Property, Plant and Equipment Useful Life (Details)	Mar. 31, 2025
Building and Building Improvements [Member] | Minimum [Member]
Property, Plant and Equipment useful life (Year)	5 years
Building and Building Improvements [Member] | Maximum [Member]
Property, Plant and Equipment useful life (Year)	40 years
Machinery and Equipment [Member] | Minimum [Member]
Property, Plant and Equipment useful life (Year)	5 years
Machinery and Equipment [Member] | Maximum [Member]
Property, Plant and Equipment useful life (Year)	20 years
Tools, Dies and Molds [Member] | Minimum [Member]
Property, Plant and Equipment useful life (Year)	3 years
Tools, Dies and Molds [Member] | Maximum [Member]
Property, Plant and Equipment useful life (Year)	5 years