Note 6 - Accrued Expenses (Tables)

12 Months Ended

Dec. 31, 2017

Notes Tables

Schedule of Accrued Liabilities [Table Text Block]

	As of December 31,
	2017		2016
Payroll and employee-related costs	$	1,318	$	1,139
Contracted service costs		7,218		2,891
Professional fees and other		413		493
Total	$	8,949	$	4,523