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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, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Income:                    
Expense                 $ 7,963 $ 7,570
Net income $ (105) $ 550 $ 462 $ 317 $ 441 $ 544 $ 774 $ 836 1,224 2,595
FUSB [Member]                    
Income:                    
Dividend income, First US Bank                 1,204 1,453
Total income                 1,204 1,453
Expense                 743 707
Gain before equity in undistributed income of subsidiaries                 461 746
Equity in undistributed income of subsidiaries                 763 1,849
Net income                 $ 1,224 $ 2,595