Note 6 - Derivative Obligations (Tables)

3 Months Ended

Sep. 30, 2017

Notes Tables

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

	Series A
	September 30, 2017			June 30, 2017
Market price of common stock	$	3.56		$	3.17
Expected volatility		102	%		110	%
Contractual term (years)		3.4			3.7
Discount rate		1.7	%		1.66	%
Dividend rate		0	%		0	%
Exercise price	$	8.00		$	8.00

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

	Balance at September 30, 2017		Level 1		Level 2		Level 3
Derivative obligation	$	743,000	$	-	$	-	$	743,000

	Balance at June 30, 2017		Level 1		Level 2		Level 3
Derivative obligation	$	730,000	$	-	$	-	$	730,000

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

	Amount
Balance – July 1, 2017	$	730,000
Change in fair value of derivative obligation		13,000
Balance – September 30, 2017	$	743,000