Note 10 - Stockholders' Equity (Tables)

6 Months Ended

Dec. 31, 2017

Notes Tables

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

	Six Month s Ended December 31,				Years Ended June 30,
	2017				2017				2016
	Number of Shares		Weighted- Average Exercise Price Per hare		Number of Shares		Weighted- Average Exercise Price Per Share		Number of Shares			Weighted- Average Exercise Price Per Share
Beginning balance		4,828,723	$	9.37		4,828,723	$	9.37		252,620		$	44.18
Warrants granted		--				--				5,238,971		$	9.83
Warrants exercised (cashless)		--				--				(51,712	)	$	13.60
Warrants expired/canceled		--				--				(611,156	)	$	17.21
Outst anding		4,828,723	$	9.37		4,828,723	$	9.37		4,828,723		$	9.37
Exercisable		4,130,194	$	9.60		4,130,194	$	9.60		600,782		$	19.02

Share-based Compensation, Stock Options, Activity [Table Text Block]

	Number of Shares			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Life		Aggregate Intrinsic Value
Outstanding at July 1, 2017		397,388		$	5.81
Granted		795,000		$	3.02
Forfeited/cancelled		(28,589	)	$	3.50
Expired		(2,439	)	$	27.04
Exercised		(5,333	)	$	2.86
Outstanding at December 31, 2017		1,156,027		$	3.92		8.5	$	26,000
Vested and Expected to Vest at December 31, 2017		629,215		$	4.67		7.3	$	25,000
Exercisable at December 31, 2017		320,319		$	6.18		5.4	$	22,000

Non Vested Stock Options Activity [Table Text Block]

	Non-vested Stock Options			Weighted-Average Grant Date Fair Value
Outstanding at July 1, 2017		155,316		$	2.39
Granted		795,000		$	2.36
Vested		(89,133	)	$	2.35
Forfeited		(25,475	)	$	2.33
Outstanding at December 31, 2017		835,708		$	2.37

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

	Six Month s Ended December 31,			Years Ended June 30,
	2017			2017			2016
Expected life (years)		6			4			5
Risk-free interest rate		2.3	%		1.3	%		1.5	%
Expected volatility		95	%		102	%		80	%
Dividend yield		0	%		0	%		0	%

Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]

	Six Months Ended December 31,					Years Ended June 30,
	2017					2017					2016
	Number of Shares			Weighted- Average Grant Date Fair Value		Number of Shares			Weighted- Average Grant Date Fair Value		Number of Shares			Weighted- Average Grant Date Fair Value
Balance at beginning of period		59,694		$	4.62		63,566		$	14.96		72,589		$	22.40
Granted		10,000		$	3.26		123,417		$	4.55		10,000		$	2.98
Vested		(69,278	)	$	4.35		(125,513	)	$	9.47		(6,120	)	$	28.94
Forfeited		--					(1,776	)	$	27.05		(12,903	)	$	41.15
Outstanding at end of period		416		$	17.60		59,694		$	4.62		63,566		$	14.96