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Note 14 - Stockholders' Equity - Outstanding Warrants (Details) - $ / shares shares in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Outstanding warrants (in shares) | 202 | 201
Outstanding warrants, weighted-average exercise price (in dollars per share) | $ 57.13 | $ 57.13
Warrants granted (in shares) | 2,431 | 1
Warrants granted, weighted average exercise price (in dollars per share) | $ 8.18 | $ 23.51
Warrants expired (in shares) | (0) | 0
Warrants expired, weighted average exercise price (in dollars per share) | $ 0 | $ 0
Warrants exercised (in shares) | (327) |
Warrants exercised, weighted-average exercise price (in dollars per share) | $ 6.30 |
Warrants expired (in shares) | 0 | 0
Outstanding warrants (in shares) | 2,306 | 202
Outstanding warrants, weighted-average exercise price (in dollars per share) | $ 7.70 | $ 57.13

X
- Definition The number of warrants or rights exercised during period. + References No definition available. + Details
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Namespace Prefix: | nby_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Weighted average exercise price per share of warrants or rights exercised during period. + References No definition available. + Details
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Namespace Prefix: | nby_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of warrants or rights forfeited during period. + References No definition available. + Details
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Namespace Prefix: | nby_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Weighted average exercise price per share of warrants or rights forfeited during period. + References No definition available. + Details
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Namespace Prefix: | nby_
Data Type: | dtr-types:perShareItemType
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X
- Definition The number of warrants or rights issued during period. + References No definition available. + Details
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Namespace Prefix: | nby_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Weighted average exercise price per share of warrants or rights issued during period. + References No definition available. + Details
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X
- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=126973232&loc=d3e21475-112644 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | instant

X
- Definition Number of warrants or rights outstanding. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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