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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
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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

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- 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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