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Note 2 - Marketable Securities - Available-for-sale Marketable Securities in Gross Unrealized Loss Position (Details) $ in Thousands | Dec. 31, 2017 USD ($)
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Estimated fair value, less than 12 months | $ 7,140
Gross unrealized holding losses, less than 12 months | (38)
Estimated fair value, more than 12 months | 2,782
Gross unrealized holding losses, more than 12 months | (39)
Estimated fair value | 9,922
Gross unrealized holding losses | (77)
Corporate Debt Securities [Member] |
Estimated fair value, less than 12 months | 3,799
Gross unrealized holding losses, less than 12 months | (20)
Estimated fair value, more than 12 months | 2,125
Gross unrealized holding losses, more than 12 months | (30)
Estimated fair value | 5,924
Gross unrealized holding losses | (50)
US States and Political Subdivisions Debt Securities [Member] |
Estimated fair value, less than 12 months | 3,341
Gross unrealized holding losses, less than 12 months | (18)
Estimated fair value, more than 12 months | 657
Gross unrealized holding losses, more than 12 months | (9)
Estimated fair value | 3,998
Gross unrealized holding losses | $ (27)

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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