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Equity Transactions - Proceeds of ATM offering (Details) - ATM Offering - USD ($)	12 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
Equity Transactions
Gross proceeds	$ 5,499,000	$ 3,237,000
Less: offering costs and expenses	203,000	117,000
Net proceeds from issuance of common stock	$ 5,296,000	$ 3,120,000

X

- Definition

Disclosure of information about sale of stock made by the entity to investor outside consolidated group by type of sale.

+ References

No definition available.

+ Details

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Namespace Prefix:	nnvc_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The cash outflow for cost incurred directly with the issuance of an equity security.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-15

+ Details

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Balance Type:	credit
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X

- Definition

The cash inflow from the additional capital contribution to the entity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 14
-Subparagraph (a)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-14

+ Details

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Period Type:	duration

X

- Definition

Amount of consideration received by subsidiary or equity investee in exchange for shares of stock issued or sold. Includes amount of cash received, fair value of noncash assets received, and fair value of liabilities assumed by the investor.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: