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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		Sep. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Prepaid expenses and other		$ 18,816	$ 22,255	$ 19,810
Accounts payable and accrued liabilities		48,259	40,060	38,100
Retained earnings		$ 484,219	$ 449,027	448,542
Accounting Standards Update 2014-09 [Member]
Prepaid expenses and other	[1]			2,445
Accounts payable and accrued liabilities				1,960
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.

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-SubTopic 10
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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
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