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Note 1 - Description of Business and Summary of Significant Accounting Policies - Basic and Diluted Net Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Net (loss) earnings | $ (8,743) | $ 20,709
Undistributed (loss) earnings | (12,095) | 17,391
Common Class A [Member] |  |
Net (loss) earnings | (1,531) | 3,521
Less dividends declared | 518 | 522
Undistributed (loss) earnings | $ (2,049) | $ 2,999
Weighted-average shares outstanding, basic and diluted (in shares) | 2,167 | 2,175
Net earnings per share, basic and diluted (in dollars per share) | $ (0.71) | $ 1.62
Common Class B [Member] |  |
Net (loss) earnings | $ (7,212) | $ 17,188
Less dividends declared | 2,834 | 2,796
Undistributed (loss) earnings | $ (10,046) | $ 14,392
Weighted-average shares outstanding, basic and diluted (in shares) | 10,117 | 9,939
Net earnings per share, basic and diluted (in dollars per share) | $ (0.71) | $ 1.73

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- Definition Amount of paid and unpaid common stock dividends declared with the form of settlement in cash. + 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=27012166&loc=d3e187085-122770 + Details
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