Note 11 - Accrued Expenses (Tables)

12 Months Ended

Dec. 31, 2018

Notes Tables

Schedule of Accrued Liabilities [Table Text Block]

	December 31,
	2018		2017
Compensation and related expenses	$	4,446	$	2,893
Professional fees		1,989		448
Voluntary recall		116		-
Research grants		400		419
Clinical trial costs		577		2,318
Income taxes payable		385		-
Other		233		248
Total	$	8,146	$	6,326