Document And Entity Information - shares	6 Months Ended
	Jun. 30, 2017	Aug. 11, 2017
Document Information [Line Items]
Entity Registrant Name	New Bancorp, Inc.
Entity Central Index Key	0001644482
Trading Symbol	nwbb
Current Fiscal Year End Date	--12-31
Entity Filer Category	Smaller Reporting Company
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	No
Entity Common Stock, Shares Outstanding (in shares)		719,531
Document Type	10-Q/A
Document Period End Date	Jun. 30, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q2
Amendment Flag	true
Amendment Description	New Bancorp, Inc. (the "Company") is filing this Amendment No. 1 on Form 10-Q/A to its Quarterly Report on Form 10-Q for quarter ended June 30, 2017, as filed with the Securities and Exchange Commission on August 14, 2017, solely for the purpose of correcting XBRL tagging within Exhibit 101. Other than as described above, no changes are made to the Quarterly Report on Form 10-Q as filed on August 14, 2017.