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Note 4 - Marketable Equity Securities (Tables) | 12 Months Ended
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Dec. 31, 2018
Notes Tables |
Marketable Securities [Table Text Block] |
|  | 2018 |  |  | 2017 |
|  | (in thousands) |
Available-for-sale securities: |  |  |  |  |  |  |  |
Fair market value |  | $ | 27,549 |  |  | $ | 26,664 |
Cost |  |  | 25,602 |  |  |  | 16,640 |
Unrealized gain |  | $ | 1,947 |  |  | $ | 10,024 |
Unrealized Gain (Loss) on Investments [Table Text Block] |
|  | 2018 |  |  | 2017 |
|  | (in thousands) |
Available-for-sale securities: |  |  |  |  |  |  |  |
Gross unrealized gains |  | $ | 5,668 |  |  | $ | 10,150 |
Gross unrealized losses |  |  | 3,721 |  |  |  | 126 |
Net unrealized gains |  | $ | 1,947 |  |  | $ | 10,024 |
Schedule of Realized Gain (Loss) [Table Text Block] |
|  | 2018 |  |  | 2017 |  |  | 2016 |
|  | (in thousands) |
Realized gains: |  |  |  |  |  |  |  |  |  |  |  |
Sale proceeds |  | $ | 1,044 |  |  | $ | 6,833 |  |  | $ | 1,550 |
Cost of securities sold |  |  | 669 |  |  |  | 2,098 |  |  |  | 547 |
Realized gains |  | $ | 375 |  |  | $ | 4,735 |  |  | $ | 1,003 |
Realized gains, net of taxes |  | $ | 278 |  |  | $ | 2,938 |  |  | $ | 627 |

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- Definition Tabular disclosure of the proceeds from sales of available-for-sale securities and the gross realized gains and gross realized losses that have been included in earnings as a result of those sales. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 + Details
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