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Summarized Financial Data (Details) Sheet http://www.bostonomaha.com/20230331/role/statement-note-8-investments-including-investments-accounted-for-using-the-equity-method-summarized-financial-data-details Note 8 - Investments, Including Investments Accounted for Using the Equity Method - Summarized Financial Data (Details) Details 53 false false R54.htm 053 - Disclosure - Note 9 - Fair Value (Details Textual) Sheet http://www.bostonomaha.com/20230331/role/statement-note-9-fair-value-details-textual Note 9 - Fair Value (Details Textual) Details http://www.bostonomaha.com/20230331/role/statement-note-9-fair-value-tables 54 false false R55.htm 054 - Disclosure - Note 9 - Fair Value - Fair Values for Investments (Details) Sheet http://www.bostonomaha.com/20230331/role/statement-note-9-fair-value-fair-values-for-investments-details Note 9 - Fair Value - Fair Values for Investments (Details) Details 55 false false R56.htm 055 - Disclosure - Note 10 - Asset Retirement Obligations - Asset Retirement Obligations (Details) Sheet http://www.bostonomaha.com/20230331/role/statement-note-10-asset-retirement-obligations-asset-retirement-obligations-details Note 10 - 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