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Note 12 - Earnings Per Share (Details Textual) | 12 Months Ended
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Dec. 31, 2018
Common Class A [Member] |
Common Stock, Voting Rights | 1/20th
Common Class B [Member] |
Common Stock, Voting Rights | 1

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- Definition Description of voting rights of common stock. Includes eligibility to vote and votes per share owned. Include also, if any, unusual voting rights. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 + Details
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Balance Type: | na
Period Type: | duration

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- Details
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