Quarterly report pursuant to Section 13 or 15(d)

Cover
- Document And Entity Information
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Notes to Financial Statements
Accounting Policies
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Notes Details

Note 10 - Leases (Details Textual)

v3.19.1

Note 10 - Leases (Details Textual)	1 Months Ended	3 Months Ended
Note 10 - Leases (Details Textual)	Jun. 30, 2017 USD ($)	Mar. 31, 2019 USD ($) ft²	Mar. 31, 2018 USD ($)	Jan. 01, 2019 USD ($)	Dec. 31, 2018 USD ($)
Operating Lease, Expense		$ 66,000
Sublease Income		94,408
Operating Lease, Right-of-Use Asset		367,442		$ 406,842
Operating Lease, Payments		$ 97,000
Accounting Standards Update 2016-02 [Member]
Operating Lease, Right-of-Use Asset				$ 407,000
Office Space at 4995 Bradenton Avenue, Dublin Ohio [Member]
Area of Real Estate Property \| ft²		5,000
Operating Lease, Monthly Base Rent		$ 3,000
Office Space at 560 Sylvan Avenue, Englewood Cliffs, New Jersey [Member]
Area of Real Estate Property \| ft²		2,000
Operating Lease, Monthly Base Rent		$ 3,000
Office Space at 5600 Blazer Parkway, Dublin, Ohio [Member]
Area of Real Estate Property \| ft²		25,000
Operating Lease, Monthly Base Rent		$ 26,000
Operating Lease, Sublease, Monthly Rent Revenue	$ 39,000
Vehicle Lease [Member]
Operating Lease, Monthly Base Rent		$ 300

- Definition

Amount of the base monthly rent required for operating lease.

+ References

No definition available.

+ Details

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

- Definition

Represents the amount of monthly rent revenue from subleased operating leases.

+ References

No definition available.

+ Details

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

- Definition

Area of a real estate property.

+ References

No definition available.

+ Details

Name:	us-gaap_AreaOfRealEstateProperty
Namespace Prefix:	us-gaap_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of operating lease expense. Excludes sublease income.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 4
-Subparagraph (b)
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+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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+ Details

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

- Definition

Amount of lessee's right to use underlying asset under operating lease.

+ References

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+ Details

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

- Definition

Amount of sublease income excluding finance and operating lease expense.

+ References

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-Publisher FASB
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- Details

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- Details

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- Details

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- Details

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- Details

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