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Note 15 - Common Stock (Details Textual) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Percentage of Common Stock A Held By One Shareholder Without Any Common Stock B | 21.60% |
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 | 0.06
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 | $ 0.07

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 + Details
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- Definition Amount of paid and unpaid common stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817 + Details
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