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Note 9 - Fair Value Measurements (Details Textual) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Deposit Assets, Total   $ 0 $ 20,200
Senior Notes [Member]      
Long-term Debt, Total $ 842,000 844,200  
Senior Notes [Member] | Fair Value, Measurements, Recurring [Member]      
Long-term Debt, Total 555,900 490,000  
Long-term Debt, Fair Value $ 564,900 $ 506,300