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Note 1 - Organization and Background	12 Months Ended
	Dec. 31, 2018
Notes to Financial Statements
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]	NOTE 1. ORGANIZATION AND BACKGROUND Boston Omaha was organized on August 11, 2009 with present management taking over operations in February 2015. Our operations include (i) our outdoor advertising business with multiple billboards across Alabama, Florida, Georgia, Illinois, Iowa, Kansas, Missouri, Nebraska, Virginia, West Virginia, and Wisconsin; (ii) our insurance business that specializes in surety bond underwriting and brokerage, and (iii) minority investments primarily in real estate services, homebuilding, and banking. Our billboard operations are conducted through our subsidiary, Link Media Holdings, LLC, and our insurance operations are conducted through our subsidiary, General Indemnity Group, LLC. We completed an acquisition of an outdoor advertising business and entered the outdoor advertising industry on June 19, 2015. During 2015, 2016, 2017 and 2018, we completed fourteen additional acquisitions of outdoor advertising businesses. On April 20, 2016, we completed an acquisition of a surety bond brokerage business. On December 7, 2016, we acquired a fidelity and surety bond business; and, from July through November 2017 we completed the acquisition of two surety brokerage businesses, and we acquired a majority stake in a third surety brokerage business, thus expanding our operations in insurance.

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The entire disclosure for organization, consolidation and basis of presentation of financial statements disclosure.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-URI http://asc.fasb.org/topic&trid=2122149

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-URI http://asc.fasb.org/topic&trid=2197479

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