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Note 22 - First US Bancshares, Inc. (Parent Company Only) Financial Information - Statements of Statements of Operations (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Expense                 $ 7,373 $ 7,963
Net income (loss) $ (1,866) $ 635 $ 416 $ 404 $ (105) $ 550 $ 462 $ 317 (411) 1,224
FUSB [Member]                    
Dividend income, First US Bank                 1,206 1,204
Total income                 1,206 1,204
Expense                 751 743
Gain before equity in undistributed income of subsidiaries                 455 461
Equity in undistributed income of subsidiaries                 (866) 763
Net income (loss)                 $ (411) $ 1,224