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Note 4 - Prepaid Expenses and Other Current Assets - Summary of Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Series E Preferred Stock deferred financing costs	$ 36	$ 0
Dues & subscriptions	59	82
Prepaid taxes & licenses	53	55
Prepaid insurance	18	48
Other receivables	6	76
Other	49	11
Total prepaid expenses and other current assets	$ 221	$ 272

X

- Definition

The amount of prepaid due and subscriptions.

+ References

No definition available.

+ Details

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Namespace Prefix:	nby_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of asset related to consideration paid in advance for income and other taxes and for licenses that provided economic benefits within a future period of one year or the normal operating cycle, if longer.

+ References

No definition available.

+ Details

Name:	nby_PrepaidTaxesAndLicenses
Namespace Prefix:	nby_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of asset related to consideration paid in advance for vendors and other receivables that provides economic benefits within a future period of one year or the normal operating cycle, if longer.

+ References

No definition available.

+ Details

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Namespace Prefix:	nby_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 835
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 1A
-Publisher FASB
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 470
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-Section 50
-Paragraph 1D
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1D

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Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of current assets classified as other.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 852
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 10
-Publisher FASB
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Publisher FASB
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Period Type:	instant

X

- Definition

Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Publisher FASB
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X

- Definition

Amount of asset related to consideration paid in advance for insurance that provides economic benefits within a future period of one year or the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 210
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-Publisher FASB
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+ Details

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Balance Type:	debit
Period Type:	instant