Note 3 - Fair Value of Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2019

Notes Tables

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

	Convertible
	Preferred Stock
	Warrant Liability			Total
	(in thousands)
Balance at January 1, 2018	$	67		$	67
Issuances		—			—
Revaluation loss included in loss on revaluation of financial instruments, net		3			3
Settlements		(70	)		(70	)
Balance at June 30, 2018	$	—		$	—
Total gains included in other income and (expenses) attributable to liabilities still held as of June 30, 2018	$	—		$	—