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Property, Plant, and Equipment (Details) - USD ($)	12 Months Ended
Property, Plant, and Equipment (Details) - USD ($)	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2024
Property plant and equipment
Gross	$ 57,795,000	$ 55,878,000
Less: accumulated depreciation and amortization	(48,557,000)	(46,645,000)
Net	9,238,000	9,233,000
Depreciation and amortization	1,911,000	1,961,000	$ 1,826,000
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	$ 7,572,000	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	$ 3,888,000	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	$ 32,459,000	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	$ 4,061,000	$ 3,657,000
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