Note 3 - Somerset Acquisition, Goodwill, In-Process Research and Development and Other Intangible Assets (Details Textual) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Feb. 28, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Payments to Acquire Businesses, Gross		$ 8,000
Finite-Lived Intangible Asset, Useful Life		6 years
Amortization of Intangible Assets, Total		$ 1,100	$ 500	$ 200
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months		1,100
Finite-Lived Intangible Assets, Amortization Expense, after Year Five		700
Finite-Lived Intangible Assets, Amortization Expense, Year Two		1,100
Finite-Lived Intangible Assets, Amortization Expense, Year Three		1,100
Finite-Lived Intangible Assets, Amortization Expense, Year Four		1,100
Finite-Lived Intangible Assets, Amortization Expense, Year Five		$ 1,100
AZEDRA [Member]
Payments to Acquire Businesses, Gross	$ 8,000