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Note 19 - Subsequent Events	9 Months Ended
	Sep. 30, 2021
Notes to Financial Statements
Subsequent Events [Text Block]	NOTE 19.     SUBSEQUENT EVENTS Subsequent to September 30, 2021, Boston Omaha Corporation sold approximately $17.1 million of its marketable equity securities.  Subsequent to September 30, 2021, we sold 73,397 shares of our Class A common stock through our at the market equity offering program with Wells Fargo Securities, resulting in net proceeds of approximately $2.7 million.

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The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 855
-URI http://asc.fasb.org/topic&trid=2122774

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 855
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6842918&loc=SL6314017-165662

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