Patents net (Details) - USD ($)	6 Months Ended
Dec. 31, 2021	Jun. 30, 2021
Patent costs - gross	$ 5,550,000	$ 5,506,000
Patent costs - net	2,607,000	2,754,000
Patents [Member]
Patent costs - gross	$ 4,082,000	4,082,000
Useful life	14 years
Accumulated amortization	$ (2,525,000)	(2,373,000)
Patents Two [Member]
Patent costs - gross	$ 144,000	144,000
Useful life	12 years
Patents Three [Member]
Patent costs - gross	$ 1,324,000	1,280,000
Useful life	17 years
Accumulated amortization	$ (418,000)	$ (379,000)

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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- Definition

Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 928
-SubTopic 340
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 926
-SubTopic 20
-Section 50
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-URI http://asc.fasb.org/extlink&oid=120154696&loc=d3e54445-107959

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