Note 13 - Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2020

Notes Tables

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

	Derivatives at Fair Value as of December 31, 2020
(in thousands)	Level 1		Level 2		Level 3		Total
Warrant liabilities		-		-		1,847		1,847
Total warrant liabilities	$	-	$	-	$	1,847	$	1,847

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

	Level 3 Liabilities
(in thousands)	Warrant Liabilities
Balance at January 1, 2019	$	(865	)
Reclassification of warrant liability to additional paid-in capital upon adoption of ASU 2017-11		865
Balance at December 31, 2019		-
Reclassification of warrant liability		1,986
Unrealized gains, net		(139	)
Balance at December 31 ,2020	$	1,847