Note 1 - General (Details Textual) - USD ($) $ in Thousands	Mar. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Other Assets, Noncurrent, Total	$ 152,445		$ 38,398
Other Accrued Liabilities, Current	72,063		35,845
Other Liabilities, Noncurrent, Total	$ 172,239		$ 96,056
Accounting Standards Update 2016-02 [Member]
Other Assets, Noncurrent, Total		$ 102,400
Other Accrued Liabilities, Current		32,300
Other Liabilities, Noncurrent, Total		$ 70,100