Note 7 - Derivative Obligations (Tables)

12 Months Ended

Dec. 31, 2019

Notes Tables

Fair Value Measurements, Recurring and Nonrecurring [Table Text Block]

	Year Ended December 31,
Derivative Obligation	2019		2018
Balance	$	-	$	1,000
Level 1	$	-	$	-
Level 2	$	-	$	-
Level 3	$	-	$	1,000

Derivative Instruments, Gain (Loss) [Table Text Block]

	Amount
Balance – December 31, 2017	$	597,000
Change in fair value of derivative obligation		(596,000	)
Balance – December 31, 2018		1,000
Change in fair value of derivative obligation		(1,000	)
Balance – December 31, 2019	$	--

Series A Warrant [Member]

Notes Tables

Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]

	Year Ended December 31,
	2019			2018
Market price of common stock	$	4.40		$	2.70
Expected volatility		96	%		94	%
Contractual term (years)		1.2			2.2
Discount rate		1.59	%		2.48	%
Dividend rate		0	%		0	%
Exercise price	$	80.00		$	80.00