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Note 3 - Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - Fair Value, Recurring [Member] - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Restricted cash held as a certificate of deposit | $ 324 | $ 332
Deposit held as a certificate of deposit | 152 | 152
Total assets | 476 | 484
Fair Value, Inputs, Level 1 [Member] |  |
Restricted cash held as a certificate of deposit | 324 | 332
Deposit held as a certificate of deposit | 152 | 152
Total assets | 476 | $ 484
Fair Value, Inputs, Level 2 [Member] |  |
Restricted cash held as a certificate of deposit | 0 |
Deposit held as a certificate of deposit | 0 |
Total assets | 0 |
Fair Value, Inputs, Level 3 [Member] |  |
Restricted cash held as a certificate of deposit | 0 |
Deposit held as a certificate of deposit | 0 |
Total assets | $ 0 |

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- Definition Fair value portion of deposit held as a certificate of deposit. + References No definition available. + Details
Name: | nby_DepositHeldAsACertificateOfDepositFairValueDisclosure
Namespace Prefix: | nby_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Fair value portion of restricted cash held as a certificate of deposit. + References No definition available. + Details
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Namespace Prefix: | nby_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
Name: | us-gaap_AssetsFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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- Details
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Namespace Prefix: |
Data Type: | na
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- Details
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Namespace Prefix: |
Data Type: | na
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |