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Note 10 - Fair Value Measurements - Assumptions Used to Determine the Fair Value of the Net Options (Details)	Sep. 30, 2021	Dec. 31, 2020
Measurement Input, Option Volatility [Member] | Cable One Option [Member]
Derivative liability, measurement input	0.300	0.280
Measurement Input, Option Volatility [Member] | MBI Net Option [Member]
Derivative liability, measurement input	0.300	0.300
Measurement Input, EBITDA Multiple [Member] | Cable One Option [Member]
Derivative liability, measurement input	0.100	0.100
Measurement Input, EBITDA Multiple [Member] | MBI Net Option [Member]
Derivative liability, measurement input	0.100	0.100
Measurement Input, Risk Free Interest Rate [Member] | Cable One Option [Member]
Derivative liability, measurement input	0.055	0.050
Measurement Input, Risk Free Interest Rate [Member] | MBI Net Option [Member]
Derivative liability, measurement input	0.065	0.065
Measurement Input, Cost of Debt [Member] | Cable One Option [Member]
Derivative liability, measurement input	0.040	0.040

X

- Definition

Value of input used to measure derivative liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

X

- Details

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Namespace Prefix:
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Balance Type:
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X

- Details

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Namespace Prefix:
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X

- Details

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X

- Details

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- Details

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- Details

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