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Note 3 - Marketable Equity Securities (Tables) | 12 Months Ended
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Dec. 31, 2017
Notes Tables |
Marketable Securities [Table Text Block] |
|  | 201 7 |  |  | 201 6 |
|  | (in thousands) |
Available-for-sale securities : |  |  |  |  |  |  |  |
Fair market value |  | $ | 26,664 |  |  | $ | 27,621 |
Cost |  |  | 16,640 |  |  |  | 15,569 |
Unrealized gain |  | $ | 10,024 |  |  | $ | 12,052 |
Unrealized Gain (Loss) on Investments [Table Text Block] |
|  | 201 7 |  |  | 201 6 |
|  | (in thousands) |
Available-for-sale securities : |  |  |  |  |  |  |  |
Gross unrealized gains |  | $ | 10,150 |  |  | $ | 12,161 |
Gross unrealized losses |  |  | 126 |  |  |  | 109 |
Net unrealized gains |  | $ | 10,024 |  |  | $ | 12,052 |
Schedule of Realized Gain (Loss) [Table Text Block] |
|  | 201 7 |  |  | 20 1 6 |  |  | 20 1 5 |
|  | (in thousands) |
Realized gains : |  |  |  |  |  |  |  |  |  |  |  |
Sale proceeds |  | $ | 6,833 |  |  | $ | 1,550 |  |  | $ | 1,500 |
Cost of securities sold |  |  | 2,098 |  |  |  | 547 |  |  |  | 434 |
Realized gains |  | $ | 4,735 |  |  | $ | 1,003 |  |  | $ | 1,066 |
Realized gains, net of taxes |  | $ | 2,938 |  |  | $ | 627 |  |  | $ | 654 |

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- Definition Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26626-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2,12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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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://www.xbrl.org/2003/role/presentationRef -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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