Annual report pursuant to Section 13 and 15(d)

Accrued Liabilities and Other (Schedule of Accrued Liabilities) (Details)

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Accrued Liabilities and Other (Schedule of Accrued Liabilities) (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Accounts Payable and Accrued Liabilities [Abstract]    
Contracted services $ 1,880,376navb_AccruedLiabilitiesContractedServices $ 3,325,391navb_AccruedLiabilitiesContractedServices
Compensation 979,296us-gaap_EmployeeRelatedLiabilitiesCurrent 1,124,976us-gaap_EmployeeRelatedLiabilitiesCurrent
Accrued interest 213,457navb_AccruedInterest 204,792navb_AccruedInterest
Other 160,991us-gaap_OtherAccruedLiabilitiesCurrent 117,804us-gaap_OtherAccruedLiabilitiesCurrent
Accrued liabilities and other, Total $ 3,234,120us-gaap_AccruedLiabilitiesAndOtherLiabilities $ 4,772,963us-gaap_AccruedLiabilitiesAndOtherLiabilities