Note 5 - Acquisition - Preliminary Allocation of the Purchase Price (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Apr. 17, 2017
Goodwill	$ 487,617	$ 487,617
Eliza Holding Corp [Member]
Cash and cash equivalents			$ 435
Accounts receivable			8,902
Prepaid expenses			1,427
Property and equipment			1,146
Intangible assets			76,240
Goodwill			107,754
Other assets			63
Accounts payable			(2,620)
Deferred tax liability			(19,681)
Other liabilities			(2,057)
Total purchase price			$ 171,609