Note 10 - Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2019

Notes Tables

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

	Financial assets and liabilities at fair value as of June 30, 2019
	Level 1		Level 2		Level 3
Money market funds (1)	$	758	$	—	$	—
Non-recurring fair value measurements (2)		—		—		5,336
Total	$	758	$	—	$	5,336

	Financial assets and liabilities at fair value as of December 31, 2018
	Level 1		Level 2		Level 3
Money market funds (1)	$	2,494	$	—	$	—
Non-recurring fair value measurements (2)		—		—		5,336
Total	$	2,494	$	—	$	5,336