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Disclosure - Note 9 - Fair Value - Fair Values for Investments (Details) Sheet http://www.bostonomaha.com/20191231/role/statement-note-9-fair-value-fair-values-for-investments-details Note 9 - Fair Value - Fair Values for Investments (Details) Details 57 false false R58.htm 057 - Disclosure - Note 10 - Income Tax Benefit (Details Textual) Sheet http://www.bostonomaha.com/20191231/role/statement-note-10-income-tax-benefit-details-textual Note 10 - Income Tax Benefit (Details Textual) Details http://www.bostonomaha.com/20191231/role/statement-note-10-income-tax-benefit-tables 58 false false R59.htm 058 - Disclosure - Note 10 - Income Tax Benefit - Components of Income Tax (Provision) Benefit (Details) Sheet http://www.bostonomaha.com/20191231/role/statement-note-10-income-tax-benefit-components-of-income-tax-provision-benefit-details Note 10 - Income Tax Benefit - Components of Income Tax (Provision) Benefit (Details) Details 59 false false R60.htm 059 - Disclosure - Note 11 - Asset Retirement Obligations - 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Disclosure - Note 15 - Industry Segments - Schedule of Segment Reporting Information, by Segment (Details) Sheet http://www.bostonomaha.com/20191231/role/statement-note-15-industry-segments-schedule-of-segment-reporting-information-by-segment-details Note 15 - Industry Segments - Schedule of Segment Reporting Information, by Segment (Details) Details 70 false false R71.htm 070 - Disclosure - Note 16 - Custodial Risk (Details Textual) Sheet http://www.bostonomaha.com/20191231/role/statement-note-16-custodial-risk-details-textual Note 16 - Custodial Risk (Details Textual) Details http://www.bostonomaha.com/20191231/role/statement-note-16-custodial-risk 71 false false R72.htm 071 - Disclosure - Note 17 - Subsequent Events (Details Textual) Sheet http://www.bostonomaha.com/20191231/role/statement-note-17-subsequent-events-details-textual Note 17 - Subsequent Events (Details Textual) Details http://www.bostonomaha.com/20191231/role/statement-note-17-subsequent-events 72 false false All Reports Book All Reports bomn-20191231.xml bomn-20191231.xsd bomn-20191231_cal.xml bomn-20191231_def.xml bomn-20191231_lab.xml bomn-20191231_pre.xml http://fasb.org/us-gaap/2019-01-31 http://fasb.org/srt/2019-01-31 http://xbrl.sec.gov/dei/2019-01-31 true true