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Note 10 - Convertible Notes (Details Textual) $ / shares in Units, $ in Thousands |  |  |  |  |  | 1 Months Ended | 2 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2024 USD ($) | Mar. 24, 2024 USD ($) $ / shares | Mar. 01, 2024 USD ($) | May 01, 2023 USD ($) | Apr. 27, 2023 USD ($) $ / shares | Dec. 31, 2023 USD ($) | May 28, 2024 USD ($) | Jun. 30, 2024 USD ($) | Mar. 31, 2024 USD ($) | Jun. 30, 2023 USD ($) | Jun. 30, 2024 USD ($) | Jun. 30, 2023 USD ($) | Jun. 09, 2023 USD ($)
Repayments of Convertible Debt |  |  |  |  |  |  |  |  |  |  | $ 1,200 | $ 193 |
Fair Value Adjustment of Warrants |  |  |  |  |  |  |  | $ 80 |  | $ (216) | (114) | (216) |
Amortization of Debt Issuance Costs and Discounts |  |  |  |  |  |  |  | $ 300 |  | 501 | $ 733 | 501 |
The 2023 Private Placement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Other Expenses |  |  |  | $ 400 |  |  |  |  |  |  |  |  |
Proceeds from Convertible Debt |  |  |  | 1,200 |  |  |  |  |  |  |  |  |
Debt Issuance Costs, Net |  |  |  | 700 |  |  |  |  |  |  |  |  |
Unsecured Convertible Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 525 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Conversion Price | $ / shares |  | $ 4.9 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Number of Equity Instruments |  | 107,146 |  |  |  |  |  |  |  |  |  |  |
Embedded Derivative, Fair Value of Embedded Derivative Liability |  |  |  |  |  |  |  |  | $ 159 |  |  |  |
Embedded Derivative, Fair Value |  |  |  |  |  |  | $ 242 |  |  |  |  |  |
Unrealized Gain (Loss) on Derivatives |  |  |  |  |  |  | $ 83 |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 144.00% |  |  |  |  |  |  | 144.00% |  |  | 144.00% |  |
Other Expenses | $ 15 | $ 111 |  |  |  |  |  | $ 14 |  |  |  |  |
Debt Issuance Costs, Net |  | $ 130 |  |  |  |  |  |  |  |  |  |  |
Original Issue Discount Senior Secured Convertible Debentures [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | 3,300 |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Conversion Price | $ / shares |  |  |  |  | $ 45.5 |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Number of Equity Instruments |  |  |  |  | 72,528 |  |  |  | 16,376 |  |  |  |
Embedded Derivative, Fair Value |  |  |  |  | $ 209 |  |  |  |  |  |  |  | $ 169
Debt Instrument, Interest Rate, Effective Percentage |  |  |  |  |  |  |  |  | 173.00% |  |  |  |
Debt Instrument, Unamortized Discount | 92 |  |  | 300 |  |  |  | 92 |  |  | $ 92 |  |
Debt Instrument, Increase (Decrease), Net |  |  |  |  | 183 |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Amount Per Month |  |  |  |  | $ 193 |  |  |  |  | $ 193 |  | $ 193 |
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger |  |  |  |  | 90.00% |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Threshold Trading Days |  |  |  |  | 10 |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage |  |  |  |  | 20.00% |  |  |  |  |  |  |  |
Repayments of Convertible Debt |  |  | $ 45 |  |  | $ 126 |  |  |  |  |  |  |
Debt Instrument, Default, Interest Rate |  |  |  |  | 18.00% |  |  |  |  |  |  |  |
Fair Value Adjustment of Warrants |  |  |  | 40 |  |  |  |  |  |  |  |  |
Debt Issuance Costs, Net | 15 |  |  | 300 |  |  |  | 15 |  |  | 15 |  |
Amortization of Debt Issuance Costs and Discounts |  |  |  |  |  |  |  | 300 |  |  | 700 |  |
Long-Term Debt, Maturity, Remainder of Fiscal Year | $ 762 |  |  |  |  |  |  | $ 762 |  |  | $ 762 |  |
Original Issue Discount Senior Secured Convertible Debentures [Member] | The 2023 Private Placement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Unamortized Discount |  |  |  | $ 300 |  |  |  |  |  |  |  |  |
Original Issue Discount Senior Secured Convertible Debentures [Member] | Measurement Input, Redemption in Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Amount Per Month |  |  |  |  | $ 193 |  |  |  |  |  |  |  |

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