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Note 9 - Shareholders' Equity (Details Textual) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 shares | Dec. 31, 2016
Number of Class A Common Stock Convertible with Each Class B Common Stock | 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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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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Balance Type: |
Period Type: |

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- Details
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Data Type: | na
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