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Note 2 - Adoption of New Accounting Standard - Cumulative Effect of Adjustments for New Accounting Pronouncements on Consolidated Condensed Balance Sheet (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Assets: |  |  |  |
Prepaid expenses and other |  | $ 19,924 | $ 22,255 | $ 19,810
Liabilities: |  |  |  |
Accounts payable and accrued liabilities |  | 43,870 | 40,060 | 38,100
Stockholders’ equity: |  |  |  |
Retained earnings |  | $ 498,595 | $ 449,027 | 448,542
Accounting Standards Update 2014-09 [Member] |  |  |  |
Assets: |  |  |  |
Prepaid expenses and other | [1] |  |  | 2,445
Liabilities: |  |  |  |
Accounts payable and accrued liabilities |  |  |  | 1,960
Stockholders’ equity: |  |  |  |
Retained earnings |  |  |  | $ 485
[1] | Contract assets balance at January 1, 2018.

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- Definition Sum of the carrying values as of the balance sheet date of obligations incurred through that date and due within one year (or the operating cycle, if longer), including liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received, taxes, interest, rent and utilities, accrued salaries and bonuses, payroll taxes and fringe benefits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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