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Note 12 - Stockholders' Equity - Preferred Stock Assumptions (Details) | Sep. 30, 2023 | Apr. 27, 2023 | Apr. 26, 2023 | Sep. 09, 2022 | Sep. 08, 2022
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Series C Preferred Stock [Member] | Measurement Input, Share Price [Member] |  |  |  |  |
Preferred stock assumption | 0.72 | 0.72 |  |  |
Series C Preferred Stock [Member] | Measurement Input, Price Volatility [Member] |  |  |  |  |
Preferred stock assumption | 0.801 | 0.801 |  |  |
Series C Preferred Stock [Member] | Measurement Input, Expected Term [Member] |  |  |  |  |
Preferred stock assumption | 0.8 | 0.8 |  |  |
Series C Preferred Stock [Member] | Measurement Input, Risk Free Interest Rate [Member] |  |  |  |  |
Preferred stock assumption | 0.0491 | 0.0491 |  |  |
Series C Preferred Stock [Member] | Measurement Input, Expected Dividend Rate [Member] |  |  |  |  |
Preferred stock assumption | 0 | 0 |  |  |
Series C Preferred Stock [Member] | Weighted Average Fair Value [Member] |  |  |  |  |
Preferred stock assumption | 0.61 | 5.35 |  |  |
Series B Preferred Stock [Member] | Measurement Input, Share Price [Member] |  |  |  |  |
Preferred stock assumption |  | 0.72 | 0.72 | 2.1 | 8.05
Series B Preferred Stock [Member] | Measurement Input, Price Volatility [Member] |  |  |  |  |
Preferred stock assumption |  | 0.801 | 0.801 | 0.796 | 0.796
Series B Preferred Stock [Member] | Measurement Input, Expected Term [Member] |  |  |  |  |
Preferred stock assumption |  | 0.8 | 0.8 | 1.3 | 1.3
Series B Preferred Stock [Member] | Measurement Input, Risk Free Interest Rate [Member] |  |  |  |  |
Preferred stock assumption |  | 0.0491 | 0.0491 | 0.0364 | 0.0364
Series B Preferred Stock [Member] | Measurement Input, Expected Dividend Rate [Member] |  |  |  |  |
Preferred stock assumption |  | 0 | 0 | 0 | 0
Series B Preferred Stock [Member] | Weighted Average Fair Value [Member] |  |  |  |  |
Preferred stock assumption |  | 0.61 | 5.35 |  |

X
- Definition Measurement input for preferred stock. + References No definition available. + Details
Name: | nby_PreferredStockMeasurementInput
Namespace Prefix: | nby_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_SeriesCPreferredStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputSharePriceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputPriceVolatilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputExpectedTermMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputRiskFreeInterestRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputExpectedDividendRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MeasurementInputTypeAxis=nby_WeightedAverageFairValueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_SeriesBPreferredStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |