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Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - $ / shares | Sep. 30, 2023 | Dec. 31, 2022
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Common Class A [Member] |  |
Common stock, par value (in dollars per share) | $ 0.01 | $ 0.01
Common Class B [Member] |  |
Common stock, par value (in dollars per share) | $ 0.01 | $ 0.01

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- Definition Face amount or stated value per share of common stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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