Note 6 - Recent Acquisition, Goodwill, In-process Research and Development and Other Intangible Assets - Summary of Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Balance, Goodwill			$ 13,074	$ 13,074
Increase related to Somerset acquisition			4,773
Amortization expense
Balance, Goodwill	$ 17,847	$ 13,074	17,847	13,074
Balance, Finite-lived Intangible Assets	6,499		6,499
Impairment		(23,200)		(23,200)
In Process Research and Development [Member]
Balance, Finite-lived Intangible Assets			600	28,700
Increase related to Somerset acquisition
Amortization expense, Finite-lived Intangible Assets				(117)
Balance, Finite-lived Intangible Assets	600	5,383	600	5,383
Impairment				(23,200)
Other Intangible Assets [Member]
Balance, Finite-lived Intangible Assets			6,066	1,669
Increase related to Somerset acquisition			1,245
Amortization expense, Finite-lived Intangible Assets			(812)	(159)
Balance, Finite-lived Intangible Assets	$ 6,499	$ 1,510	$ 6,499	$ 1,510