Note 7 - Embedded Derivatives Liabilities (Tables)

9 Months Ended

Sep. 30, 2020

Notes Tables

Defined Benefit Plan, Assumptions [Table Text Block]

	September 30,			December 31,
	2020			2019
Stock price	$	1.00		$	2.31
Conversion Rate per $1,000		409.50			67.95
Conversion Price	$	2.44		$	14.72
Maturity date	December 31, 2020			March 15, 2020
Risk-free interest rate		0.10	%		1.52	%
Estimated stock volatility		247	%		60	%
Estimated credit spread		36	%		27	%

Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]

	Issuance Date	Expiration Date	Exercise Price as of September 30, 2020		Shares Underlying Warrants on Issuance Date		Shares Issued upon Warrant Exercises as of September 30, 2020		Shares Underlying Warrants Outstanding as of September 30, 2020
Series D Warrants	12/11/2015	12/11/2020	$	40.00		25,125		25,078		47
Series F Warrants	04/01/2016	04/01/2021	$	40.00		25,733		11,692		14,041
Series I Warrants	09/13/2016	09/13/2021	$	220.00		35,368		—		35,368
Series K Warrants	02/17/2017	2/17/2022	$	2.00		311,236		308,660		2,576
Series 2020-A Warrants (1)	7/6/2020	7/6/2025	$	0.60		30,000,000		27,317,834		2,682,166
Series 2020-B Warrants (1)	7/6/2020	7/6/2025	$	0.01		9,103,334		9,103,334		—
Series 2020-C Warrants (1)	8/25/2020	8/25/2025	$	0.01		16,532,232		16,532,232		—
						56,033,028		53,298,830		2,734,198

Exercise of Warrants [Table Text Block]

	Common Stock Issued	Proceeds
Series 2020-A Warrants	27,317,834	$	16,391
Series 2020-B Warrants	9,103,334		91
Series 2020-C Warrants	16,532,232		165
	52,953,400	$	16,647