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Note 13 - Shareholders' Equity (Details Textual) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 shares | Dec. 31, 2019
Number of Class A Common Stock Convertible with Each Class B Common Stock (in shares) | 1 |
Common Class A [Member] |  |
Common Stock, Votes Per Share | 1 | 1
Common Class B [Member] |  |
Common Stock, Votes Per Share | 10 | 10

X
- Definition The number of votes per share of common stock. + References No definition available. + Details
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Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of shares convertible with each class of common stock. + References No definition available. + Details
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |