Property, Plant, and Equipment (Details) - USD ($)	3 Months Ended		9 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024	Jun. 30, 2024
Property plant and equipment
Gross	$ 55,641,000		$ 55,641,000		$ 53,857,000
Less: accumulated depreciation and amortization	(46,154,000)		(46,154,000)		(44,780,000)
Net	9,487,000		9,487,000		9,077,000
Depreciation and amortization	493,000	$ 454,000	1,469,000	$ 1,374,000
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		7,539,000
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	$ 3,715,000		$ 3,715,000		3,613,000
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	$ 30,906,000		$ 30,906,000		29,761,000
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	$ 3,657,000		$ 3,657,000		$ 3,129,000
Property, Plant, and Equipment, Useful Life, Term, Description [Extensible Enumeration]	us-gaap:UsefulLifeShorterOfTermOfLeaseOrAssetUtilityMember		us-gaap:UsefulLifeShorterOfTermOfLeaseOrAssetUtilityMember