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Note 4 - Acquisitions - Summary of Estimated Fair Value of the Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 12, 2018	Dec. 31, 2017
Business Combination Separately Recognized Transactions [Line Items]
Goodwill	$ 271,424		$ 43,626
Halo Pharma [Member]
Business Combination Separately Recognized Transactions [Line Items]
Cash		$ 2,792
Account receivable and Contract assets		14,045
Inventory		8,298
Other current assets		1,110
Property, plant and equipment		78,364
Goodwill		228,504
Intangible assets		180,000
Total assets acquired		513,113
Current liabilities		16,058
Noncurrent liabilities		69,666
Total liabilities assumed		$ 85,724