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Note 24 - Fair Value Measurements (Details Textual) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Available-for-sale Securities $ 538,108 $ 487,869
Fair Value, Inputs, Level 3 [Member]    
Available-for-sale Securities 1,718 219
Corporate Debt Securities [Member]    
Available-for-sale Securities 9,579 $ 14,938
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]    
Available-for-sale Securities $ 1,500