Note 2 - Acquisitions - Summary of the Clariphy Acquisition Preliminary Purchase Price Allocation (Details) - USD ($) $ in Thousands	1 Months Ended
	Dec. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 12, 2016
Goodwill		$ 104,502	$ 104,502
ClariPhy Communications Inc.[Member]
Cash	$ 7,417			$ 7,417
Receivables	3,154			2,552
Receivables	602
Inventories	13,774			13,774
Other current assets	2,616			2,739
Other current assets	(123)
Property and equipment	6,163			6,163
Identifiable intangible assets	138,558			138,558
In-process research and development	97,340			97,340
Other noncurrent assets	753			753
Accounts payable, accrued expenses and other current liabilities	(13,665)			(13,667)
Accounts payable, accrued expenses and other current liabilities	2
Deferred tax liabilities, noncurrent	(42,864)			(42,958)
Deferred tax liabilities, noncurrent	94
Other liabilities	(5,647)			(5,647)
Total identifiable net assets	207,599			207,024
Total identifiable net assets	575
Goodwill	96,062			96,637
Goodwill	(575)
Net assets acquired	$ 303,661			$ 303,661