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Disclosure - Note 14 - Employee Benefit Plan (Details Textual) Sheet http://www.wilsonbank.com/20191231/role/statement-note-14-employee-benefit-plan-details-textual Note 14 - Employee Benefit Plan (Details Textual) Details http://www.wilsonbank.com/20191231/role/statement-note-14-employee-benefit-plan 88 false false R89.htm 088 - Disclosure - Note 15 - Dividend Reinvestment Plan (Details Textual) Sheet http://www.wilsonbank.com/20191231/role/statement-note-15-dividend-reinvestment-plan-details-textual Note 15 - Dividend Reinvestment Plan (Details Textual) Details http://www.wilsonbank.com/20191231/role/statement-note-15-dividend-reinvestment-plan 89 false false R90.htm 089 - Disclosure - Note 16 - Regulatory Matters and Restrictions on Dividends - Summary of Company's and Wilson Banks Actual Capital Amounts and Ratios (Details) Sheet http://www.wilsonbank.com/20191231/role/statement-note-16-regulatory-matters-and-restrictions-on-dividends-summary-of-companys-and-wilson-banks-actual-capital-amounts-and-ratios-details Note 16 - 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