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Property, Plant, and Equipment (Details) - USD ($)
3 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Jun. 30, 2025
Property plant and equipment      
Gross $ 56,070,000   $ 55,878,000
Less: accumulated depreciation and amortization (47,142,000)   (46,645,000)
Net 8,928,000   9,233,000
Depreciation and amortization 496,000 $ 470,000  
Land      
Property plant and equipment      
Gross 904,000   904,000
Buildings      
Property plant and equipment      
Gross $ 8,911,000   8,911,000
Buildings | Minimum      
Property plant and equipment      
Useful life 30 years    
Buildings | Maximum      
Property plant and equipment      
Useful life 40 years    
Molds and dies      
Property plant and equipment      
Gross $ 7,548,000   7,548,000
Molds and dies | Minimum      
Property plant and equipment      
Useful life 3 years    
Molds and dies | Maximum      
Property plant and equipment      
Useful life 5 years    
Furniture and fixtures      
Property plant and equipment      
Gross $ 3,835,000   3,805,000
Furniture and fixtures | Minimum      
Property plant and equipment      
Useful life 5 years    
Furniture and fixtures | Maximum      
Property plant and equipment      
Useful life 10 years    
Machinery and equipment      
Property plant and equipment      
Gross $ 31,215,000   31,053,000
Machinery and equipment | Minimum      
Property plant and equipment      
Useful life 3 years    
Machinery and equipment | Maximum      
Property plant and equipment      
Useful life 10 years    
Building improvements      
Property plant and equipment      
Gross $ 3,657,000   $ 3,657,000
Property, Plant, and Equipment, Useful Life, Term, Description [Extensible Enumeration] us-gaap:UsefulLifeShorterOfTermOfLeaseOrAssetUtilityMember