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Note 13 - Warrant Liability (Details Textual) - USD ($) $ in Thousands			1 Months Ended	3 Months Ended		12 Months Ended
	Oct. 27, 2020	Mar. 06, 2020	Mar. 31, 2020	Dec. 31, 2020	Sep. 30, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Nov. 02, 2021	Sep. 30, 2019	Aug. 13, 2019
Class of Warrant or Right, Outstanding (in shares)				7,067,000		7,082,000	7,067,000
Proceeds from Warrant Exercises					$ 6,800	$ 0	$ 7,098	$ 67
The July 2011 Warrants [Member]
Class of Warrant or Right, Expired During Period (in shares)		35,107	35,107
Class of Warrant or Right, Outstanding (in shares)				0		0	0
October 2015 Warrants [Member]
Class of Warrant or Right, Expired During Period (in shares)	15,320				15,320
Class of Warrant or Right, Outstanding (in shares)				0		0	0
Class of Warrant or Right, Exercised During Period (in shares)				22,680	22,680
Proceeds from Warrant Exercises				$ 5	$ 5
Embedded Derivative, No Longer Bifurcated, Amount Reclassified to Stockholders' Equity				$ 12
The 2019 Domestic Warrants [Member]
Class of Warrant or Right, Outstanding (in shares)				0		0	0
Warrants and Rights Outstanding				$ 4,900			$ 4,900			$ 3,100	$ 3,100
Warrants and Rights Outstanding				4,900			4,900			$ 3,100	3,100
The 2019 Foreign Warrants [Member]
Warrants and Rights Outstanding				4,200			4,200				2,000
Warrants and Rights Outstanding				4,200			4,200				2,000
The 2019 Ladenburg Warrants [Member]
Embedded Derivative, No Longer Bifurcated, Amount Reclassified to Stockholders' Equity						$ 0	9,108	$ 553
Warrants and Rights Outstanding				200			200				100
Warrants and Rights Outstanding				$ 200			$ 200				$ 100
The 2021 Warrants [Member]
Warrants and Rights Outstanding						9,600			$ 14,200
Warrants and Rights Outstanding						$ 9,600			$ 14,200

X

- Definition

The number of warrants or rights exercised during period.

+ References

No definition available.

+ Details

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Namespace Prefix:	nby_
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X

- Definition

The number of warrants or rights which expired unexercised during period.

+ References

No definition available.

+ Details

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X

- Definition

Number of warrants or rights outstanding.

+ References

No definition available.

+ Details

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X

- Definition

The amount of the liability for the conversion option reclassified to stockholders' equity when the embedded option no longer required separation from the host instrument.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 15
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=35708913&loc=d3e50896-113970

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X

- Definition

The cash inflow associated with the amount received from holders exercising their stock warrants.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3255-108585

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X

- Definition

Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price.

+ References

No definition available.

+ Details

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