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Note 2 - Schedule of Adoption of New Revenue Standard Impacted the Consolidated Financial Statements - Balance Sheet (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Contract assets	$ 112,845
Inventories, net	103,648		$ 138,542
Taxes payable	2,727		43
Retained earnings	537,251		$ 429,826
Accounting Standards Updated 2014-09 [Member] \| Effect of Change [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Contract assets	112,845
Inventories, net	(66,905)
Taxes payable	9,405
Retained earnings	36,131	$ 16,219
Accounting Standards Updated 2014-09 [Member] \| Amount Without Adoption of ASC 606 [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Inventories, net	170,553
Taxes payable	(6,678)
Retained earnings	$ 501,120