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Note 9 - Fair Value (Details Textual) - USD ($)	3 Months Ended		9 Months Ended		21 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021
Long-term Debt, Fair Value	$ 22,938,150		$ 22,938,150		$ 22,938,150
Long-term Debt, Total	22,175,535		22,175,535		22,175,535
Fair Value Adjustment of Warrants	1,019,917	$ (0)	(2,039,835)	$ (0)
Fair Value, Inputs, Level 1 [Member]
Assets Held-in-trust, Total	$ 138,742,756		138,742,756		138,742,756
Boston Omaha [Member]
Equity Securities, FV-NI, Realized Gain (Loss), Total			$ 34,000,000	$ 5,000,000	$ 39,000,000

X

- Definition

The total amount of cash and securities held by third party trustees pursuant to terms of debt instruments or other agreements as of the date of each statement of financial position presented, which can be used by the trustee only to pay the noncurrent portion of specified obligations.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
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-Section S99
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- Definition

Amount of realized gain (loss) from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

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Amount of expense (income) related to adjustment to fair value of warrant liability.

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X

- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

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- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

No definition available.

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