Note 7 - Embedded Derivatives Liabilities - Exercise of Warrants (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020	Sep. 30, 2019
Common Stock Issued (in shares)		52,953,400
Proceeds		$ 16,647
The Series 2020 A Warrants [Member]
Common Stock Issued (in shares)	27,317,834	27,317,834
Proceeds	$ 16,400	$ 16,391
Series 2020 B Warrants [Member]
Common Stock Issued (in shares)		9,103,334
Proceeds		$ 91
Series 2020C Warrants [Member]
Common Stock Issued (in shares)		16,532,232
Proceeds		$ 165