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 17 - Subsequent Events (Details Textual)

v3.8.0.1

Note 17 - Subsequent Events (Details Textual) - USD ($) $ in Millions							1 Months Ended
	Apr. 12, 2018	Apr. 09, 2018	Apr. 02, 2018	Mar. 26, 2018	Jan. 16, 2018	Mar. 03, 2017	Dec. 31, 2017
CRG Loan Agreement, Texas Case [Member] \| Judicial Ruling [Member]
Loss Contingency, Damages Awarded, Value, Amount not Taken into Consideration					$ 4.1		$ 4.1
Loss Contingency, Damages Awarded,Value, Requested Modified Amount					2.9
CRG Loan Agreement, Texas Case [Member] \| Judicial Ruling [Member] \| Surety Bond [Member]
Loss Contingency, Amount Awarded to Other Party				$ 7.7
CRG Loan Agreement, Texas Case [Member] \| Judicial Ruling [Member] \| Maximum [Member]
Loss Contingency, Damages Awarded, Value						$ 66.0	$ 66.0
CRG Loan Agreement, Texas Case [Member] \| Pending Litigation [Member]
Loss Contingency, Damages Awarded, Value, Amount not Taken into Consideration					4.1
Loss Contingency, Damages Awarded,Value, Requested Modified Amount					$ 2.9
Subsequent Event [Member] \| CRG [Member]
Draws on Letter of Credit		$ 7.1
Subsequent Event [Member] \| CRG Loan Agreement, Ohio Case [Member] \| Pending Litigation [Member]
Loss Contingency, Damages Sought, Value	$ 4.1
Sale of Assets to Cardinal Health 414 [Member] \| Subsequent Event [Member]
Sale of Assets, Cash Received from Buyer as Result of Amendment			$ 6.0
Sale of Assets, Maximum Amount Receivable from Buyer for Unused Portion of Letter of Credit			$ 7.1

- Definition

Represents the amount drawn on a letter of credit.

+ References

No definition available.

+ Details

Name:	navb_DrawsOnLetterOfCredit
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

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

- Definition

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

+ References

No definition available.

+ Details

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

- Definition

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

+ References

No definition available.

+ Details

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

- Definition

Cash received from the purchaser as part of an asset purchase agreement.

+ References

No definition available.

+ Details

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

- Definition

Maximum amount receivable from the purchaser in an asset purchase agreement for the unused portion of a letter of credit.

+ References

No definition available.

+ Details

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

- 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

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14435-108349

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

+ Details

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

- Definition

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

+ References

+ Details

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

- Details

Name:	srt_LitigationCaseAxis=navb_CRGLoanAgreementTexasCaseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LitigationStatusAxis=us-gaap_JudicialRulingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LossContingenciesByNatureOfContingencyAxis=us-gaap_SuretyBondMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LitigationStatusAxis=us-gaap_PendingLitigationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_CounterpartyNameAxis=navb_CRGMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_LitigationCaseAxis=navb_CRGLoanAgreementOhioCaseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=navb_SaleOfAssetsToCardinalHealth414Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: