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Note 24 - 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, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017
Income: |  |  |  |  |  |  |  |  |  |
Expense |  |  |  |  |  |  |  |  | $ 5,965 | $ 5,714
Net income (loss) | $ 1,477 | $ 240 | $ 359 | $ 414 | $ (1,866) | $ 635 | $ 416 | $ 404 | 2,490 | (411)
FUSB [Member] |  |  |  |  |  |  |  |  |  |
Income: |  |  |  |  |  |  |  |  |  |
Dividend income, First US Bank |  |  |  |  |  |  |  |  | 976 | 1,206
Total income |  |  |  |  |  |  |  |  | 976 | 1,206
Expense |  |  |  |  |  |  |  |  | 831 | 751
Gain before equity in undistributed income of subsidiaries |  |  |  |  |  |  |  |  | 145 | 455
Equity in undistributed income of subsidiaries |  |  |  |  |  |  |  |  | 2,345 | (866)
Net income (loss) |  |  |  |  |  |  |  |  | $ 2,490 | $ (411)

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