Quarterly report pursuant to Section 13 or 15(d)

Cover
- Document And Entity Information
Financial Statements
Notes to Financial Statements
Accounting Policies
- Significant Accounting Policies (Policies)
Notes Tables
Notes Details

Note 11 - Commitments and Contingencies (Details Textual)

v3.8.0.1

Note 11 - Commitments and Contingencies (Details Textual) - USD ($)								1 Months Ended
	Apr. 12, 2018	Apr. 09, 2018	Mar. 26, 2018	Jan. 16, 2018	Nov. 02, 2017	Mar. 31, 2017	Mar. 03, 2017	Dec. 31, 2017	Mar. 31, 2017
CRG [Member] \| Subsequent Event [Member]
Draws on Letter of Credit		$ 7,100,000
CRG Loan Agreement, Texas Case [Member] \| Judicial Ruling [Member]
Loss Contingency, Damages Awarded, Value, Additional Amount							$ 7,000,000	$ 7,000,000
Loss Contingency, Damages Awarded, Value, Amount not Taken into Consideration				$ 4,100,000				4,100,000
Loss Contingency, Damages Awarded,Value, Requested Modified Amount				2,900,000
CRG Loan Agreement, Texas Case [Member] \| Judicial Ruling [Member] \| Surety Bond [Member]
Loss Contingency, Amount Awarded to Other Party			$ 7,700,000
CRG Loan Agreement, Texas Case [Member] \| Pending Litigation [Member]
Loss Contingency, Damages Awarded, Value, Amount not Taken into Consideration				4,100,000
Loss Contingency, Damages Awarded,Value, Requested Modified Amount				$ 2,900,000
CRG Loan Agreement, Ohio Case [Member] \| Pending Litigation [Member] \| Subsequent Event [Member]
Loss Contingency, Damages Sought, Value	$ 4,100,000
Platinum-Montaur Life Sciences LLC Litigation [Member] \| Pending Litigation [Member]
Loss Contingency, Damages Sought, Value					$ 1,900,000
Maximum [Member] \| CRG Loan Agreement, Texas Case [Member] \| Judicial Ruling [Member]
Loss Contingency, Damages Awarded, Value							66,000,000	$ 66,000,000
CRG [Member] \| Term Loan Agreement [Member] \| CRG Loan Agreement, Texas Case [Member] \| Judicial Ruling [Member]
Repayments of Debt						$ 59,000,000	59,000,000		$ 59,000,000
CRG [Member] \| Term Loan Agreement [Member] \| Maximum [Member]
Debt Instrument, Agreed-upon Final Payoff Amount							$ 66,000,000

- Definition

Represents the agreed-upon final payoff amount in connection with a debt instrument.

+ References

No definition available.

+ Details

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Namespace Prefix:	navb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Represents the amount drawn on a letter of credit.

+ References

No definition available.

+ Details

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Namespace Prefix:	navb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount awarded to other party in judgment of litigation.

+ References

No definition available.

+ Details

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Namespace Prefix:	navb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Represents the additional amount owed related to a loss contingency.

+ References

No definition available.

+ Details

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Namespace Prefix:	navb_
Data Type:	xbrli:monetaryItemType
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- Definition

Represents the amount that was not taken into consideration related to damages awarded.

+ References

No definition available.

+ Details

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Namespace Prefix:	navb_
Data Type:	xbrli:monetaryItemType
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- Definition

Represents the amount of requested modified amount related to damages awarded.

+ References

No definition available.

+ Details

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Namespace Prefix:	navb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of damages awarded to the plaintiff in the legal matter.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 9
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14557-108349

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-SubTopic 20
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-Paragraph 4
-Subparagraph (a)
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349

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Balance Type:	debit
Period Type:	duration

- Definition

The value (monetary amount) of the award the plaintiff seeks in the legal matter.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585

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