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Note 5 - Acquisitions - Summary of Estimated Fair Value of the Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Sep. 12, 2018	Dec. 31, 2017
Business Combination Separately Recognized Transactions [Line Items]
Goodwill	$ 261,095		$ 43,626
Halo Pharma [Member]
Business Combination Separately Recognized Transactions [Line Items]
Cash		$ 2,792
Account receivable and Contract assets		14,045
Inventory		8,264
Other current assets		896
Property, plant and equipment		78,489
Goodwill		219,294
Total assets acquired		503,780
Current liabilities		15,407
Noncurrent liabilities		60,984
Total liabilities assumed		76,391
Halo Pharma [Member] \| Customer Relationships [Member]
Business Combination Separately Recognized Transactions [Line Items]
Intangible assets (Customer relationships)		$ 180,000