Property, Plant, and Equipment (Details) - USD ($)	3 Months Ended		6 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2025	Dec. 31, 2024	Jun. 30, 2025
Property plant and equipment
Gross	$ 56,656,000		$ 56,656,000		$ 55,878,000
Less: accumulated depreciation and amortization	(47,631,000)		(47,631,000)		(46,645,000)
Net	9,025,000		9,025,000		9,233,000
Depreciation and amortization	488,000	$ 506,000	986,000	$ 976,000
Land
Property plant and equipment
Gross	904,000		904,000		904,000
Buildings
Property plant and equipment
Gross	$ 8,911,000		$ 8,911,000		8,911,000
Buildings | Minimum
Property plant and equipment
Useful life	30 years		30 years
Buildings | Maximum
Property plant and equipment
Useful life	40 years		40 years
Molds and dies
Property plant and equipment
Gross	$ 7,548,000		$ 7,548,000		7,548,000
Molds and dies | Minimum
Property plant and equipment
Useful life	3 years		3 years
Molds and dies | Maximum
Property plant and equipment
Useful life	5 years		5 years
Furniture and fixtures
Property plant and equipment
Gross	$ 3,855,000		$ 3,855,000		3,805,000
Furniture and fixtures | Minimum
Property plant and equipment
Useful life	5 years		5 years
Furniture and fixtures | Maximum
Property plant and equipment
Useful life	10 years		10 years
Machinery and equipment
Property plant and equipment
Gross	$ 31,655,000		$ 31,655,000		31,053,000
Machinery and equipment | Minimum
Property plant and equipment
Useful life	3 years		3 years
Machinery and equipment | Maximum
Property plant and equipment
Useful life	10 years		10 years
Building improvements
Property plant and equipment
Gross	$ 3,783,000		$ 3,783,000		$ 3,657,000
Property, Plant, and Equipment, Useful Life, Term, Description [Extensible Enumeration]	us-gaap:UsefulLifeShorterOfTermOfLeaseOrAssetUtilityMember		us-gaap:UsefulLifeShorterOfTermOfLeaseOrAssetUtilityMember