Note 8 - Acquired Intangible Assets, Net (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Jan. 31, 2015
In Process Research Development [Member] | Research and Development Expense [Member]
Impairment of Intangible Assets, Finite-lived	$ 700,000
Developed Technology Rights [Member] | Reclassified from in Process Research and Development [Member]
Finite-Lived Intangible Assets, Gross				$ 400,000
Finite-Lived Intangible Assets, Amortization Expense, Year Two	900,000
Finite-Lived Intangible Assets, Amortization Expense, Year Five	900,000
Finite-Lived Intangible Assets, Amortization Expense, Year Three	900,000
Amortization of Intangible Assets	1,100,000	$ 2,100,000	$ 2,100,000
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	1,000,000
Finite-Lived Intangible Assets, Amortization Expense, Year Four	900,000
Finite-Lived Intangible Assets, Amortization Expense, after Year Five	$ 3,800,000