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Note 11 - Marketable Securities (Details Textual) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jan. 01, 2018
Payments to Acquire Marketable Securities, Total | $ 63 | $ 9,822 |  | $ 2,466 |
Maximum [Member] |  |  |  |  |
Held-to-maturity Securities, Debt Maturities, Period | 5 years |  |  |  |
Accounting Standards Update 2016-01 [Member] | Other Income, Net [Member] |  |  |  |  |
Marketable Securities, Gain (Loss), Total | $ 3,500 |  |  |  |
Retained Earnings [Member] | Accounting Standards Update 2016-01 [Member] |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  | $ (1,136) | [1] |  | $ (1,100)
[1] | Represents the impact of change in accounting principles for its respective Accounting Standard Updates ("ASU"). See Footnote 1 of the Notes to Consolidated Financial Statements for additional disclosure.

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- Definition Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption. + References No definition available. + Details
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- Definition Amount of cash outflow for purchase of marketable security. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26853-111562 + Details
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