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Note 16 - Common Stock (Details Textual) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Dividends, Common Stock, Total | $ 3.4 | $ 3.4
Common Class A [Member] |  |
Common Stock, Dividends, Per Share, Declared (in dollars per share) | $ 0.24 | $ 0.24
Common Class A [Member] | Quarterly Dividends [Member] |  |
Common Stock, Dividends, Per Share, Declared (in dollars per share) | $ 0.06 |
Common Class A [Member] | One Shareholder [Member] |  |
Common Stock, Ownership, Percent | 18.20% |
Common Class B [Member] |  |
Common Stock, Dividends, Per Share, Declared (in dollars per share) | $ 0.28 | $ 0.28
Common Class B [Member] | Quarterly Dividends [Member] |  |
Common Stock, Dividends, Per Share, Declared (in dollars per share) | $ 0.07 |

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