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Note 1 - Description of Business	12 Months Ended
	Dec. 31, 2017
Notes to Financial Statements
Nature of Operations [Text Block]	1. DESCRIPTION OF BUSINESS First US Bancshares, Inc. (“Bancshares ”) and its wholly-owned subsidiary, First US Bank (the “Bank”), provide commercial banking services to customers through sixteen banking offices located in Birmingham, Bucksville, Butler, Calera, Centreville, Columbiana, Gilbertown, Grove Hill, Harpersville, Jackson, Thomasville, Tuscaloosa and Woodstock, Alabama, as well as a loan production office located in Mountain Brook, Alabama.   The Bank owns all of the stock of Acceptance Loan Company, Inc. (“ ALC”), an Alabama corporation. ALC is a finance company organized for the purpose of making consumer loans and purchasing consumer loans from vendors. ALC has offices located within the communities served by the Bank, as well as offices outside of the Bank’s market area in Alabama and southeast Mississippi. The Bank also owns all of the stock of FUSB Reinsurance, Inc. (“FUSB Reinsurance”), an Arizona corporation. FUSB Reinsurance is an insurance company that underwrites credit life and accidental death insurance related to loans written by the Bank and ALC.

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- Definition

The entire disclosure for the nature of an entity's business, major products or services, principal markets including location, and the relative importance of its operations in each business and the basis for the determination, including but not limited to, assets, revenues, or earnings. For an entity that has not commenced principal operations, disclosures about the risks and uncertainties related to the activities in which the entity is currently engaged and an understanding of what those activities are being directed toward.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-URI http://asc.fasb.org/topic&trid=2134479

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