Note 7 - Derivative Obligations (Tables)

6 Months Ended

Jun. 30, 2019

Notes Tables

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

	Series A
	June 30, 2019	December 31, 2018
Market price of common stock	$2.81	$2.70
Expected volatility	93%	94%
Contractual term (years)	1.7	2.2
Discount rate	1.81%	2.48%
Dividend rate	0%	0%
Exercise price	$80.00	$80.00

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

	Derivative Obligation
	June 30, 2019	December 31, 2018
Balance	$1,000	$1,000
Level 1	$--	$-
Level 2	$--	$-
Level 3	$1,000	$1,000

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

	Amount
Balance – December 31, 2018	$	1,000
Change in fair value of derivative obligation		--
Balance – June 30, 2019	$	1,000