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Property, Plant, and Equipment (Details) - USD ($)
12 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2023
Property plant and equipment      
Gross $ 55,878,000 $ 53,857,000  
Less: accumulated depreciation and amortization (46,645,000) (44,780,000)  
Net 9,233,000 9,077,000  
Depreciation and amortization 1,961,000 1,826,000 $ 1,569,000
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 7,539,000  
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 $ 3,805,000 3,613,000  
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 $ 31,053,000 29,761,000  
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 $ 3,129,000  
Property, Plant, and Equipment, Useful Life, Term, Description [Extensible Enumeration] us-gaap:UsefulLifeShorterOfTermOfLeaseOrAssetUtilityMember us-gaap:UsefulLifeShorterOfTermOfLeaseOrAssetUtilityMember