Note 8 - Derivative Obligations (Tables)

6 Months Ended

Dec. 31, 2017

Notes Tables

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

	Series A
	December 31, 2017			June 30, 2017			June 30, 2016
Market price of common stock	$	3.00		$	3.17		$	2.93
Expected volatility		107	%		110	%		99	%
Contractual term (years)		3.2			3.7			4.7
Discount rate		1.99	%		1.66	%		1.01	%
Dividend rate		0	%		0	%		0	%
Exercise price	$	8.00		$	8.00		$	8.00

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

	Derivative Obligation
	December 31, 2017		June 30, 2017		June 30, 2016
Balance	$	597,000	$	730,000	$	670,000
Level 1	$	-	$	-	$	-
Level 2	$	-	$	-	$	-
Level 3	$	597,000	$	730,000	$	670,000

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

	Amount
Balance – July 1, 2015	$	-
Addition of derivative obligation at fair value on date of issuance		4,282,000
Reclassification of derivative obligation for exercised warrants		(58,000	)
Extinguishment of derivative obligation		(159,000	)
Change in fair value of derivative obligation		(3,395,000	)
Balance – June 30, 2016		670,000
Change in fair value of derivative obligation		60,000
Balance – June 30, 2017		730,000
Change in fair value of derivative obligation		(133,000	)
Balance – December 31, 2017	$	597,000