Note 3 - Recent Accounting Pronouncements (Details Textual) - USD ($) $ in Thousands	Jun. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Operating Lease, Liability, Total	$ 37,858		$ 0
Operating Lease, Right-of-Use Asset	$ 36,515		$ 0
Accounting Standards Update 2016-02 [Member]
Operating Lease, Liability, Total		$ 41,200
Operating Lease, Right-of-Use Asset		$ 40,600