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Note 18 - Income Taxes - Balance Sheet Presentation of Deferred Taxes (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Non-current deferred tax assets $ 107,605
Non-current deferred tax liabilities (35,382) (32,654)
Total Non-current deferred tax assets, net 20,135    
Total   (35,382) (32,654)
Uncertain tax benefit offset (1) [1] (95)
Total $ 20,135    
[1] The non-current deferred tax asset has been reduced by the uncertain tax benefit of $0.1 million in accordance with ASU 2013-11