Note 6 - Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2017

Notes Tables

Fair Value, Liabilities Measured on Recurring Basis [Table Text Block]

	Investments at Fair Value as of September 30, 2017
(in thousands)	Level 1		Level 2			Level 3			Total
Warrant liabilities		-		(4,537	)		(2,105	)		(6,642	)
Total warrant liabilities	$	-	$	(4,537	)	$	(2,105	)	$	(6,642	)

Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]

	Level 3 Liabilities
(in thousands)	Warrant Liabilities
Balance at July 1, 2017	$	2,240
Unrealized Gains		(135	)
Balance at September 30 ,2017	$	2,105

	Level 3 Liabilities
(in thousands)	Warrant Liabilities
Balance at January 1, 2017	$	-
New warrants issued		2,895
Unrealized Gains, net		(258	)
Transfers to level 2		(532	)
Balance at September 30 ,2017	$	2,105