Note 7 - Convertible Preferred Stock and Common Stock Warrants (Details Textual)			1 Months Ended	3 Months Ended		6 Months Ended		10 Months Ended
	May 01, 2017 $ / shares shares	Mar. 31, 2017 $ / shares shares	Mar. 31, 2017 USD ($) $ / shares shares	Jun. 30, 2017 USD ($) $ / shares $ / item shares	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($) $ / shares $ / item shares	Jun. 30, 2016 USD ($)	Jan. 07, 2018 USD ($)	Mar. 14, 2017 $ / item
Stock Reclassified Upon Conversion of Preferred Stock						$ 70,890
Make-Whole Provision Conversion Price, Percentage						105.00%
Fair Value Adjustment of Warrants				$ (23,387,850)		$ (10,468,176)
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares				$ 2.22		$ 2.22
Class of Warrant or Right, Term						4 years 273 days
Warrant Expense						$ 10,225,846
Dividends						$ 546,305
Maximum [Member]
Convertible Preferred Stock, Conversion Price | shares				2.02		2.02
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares				$ 750		$ 750
Minimum [Member]
Financing Trigger from Issuance of Common Stock				$ 10,000,000		$ 10,000,000
Convertible Preferred Stock, Make-Whole Provision, Proceeds from Issue of Common Stock						$ 10,000,000
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares				$ 20		$ 20
Warrant [Member]
Class of Warrant or Rights, Expired | shares						3,000
Warrant Expense				$ 2,600,000		$ 2,600,000
Private Placement [Member]
Convertible Preferred Stock, Votes Per Share | $ / item				0.50627		0.50627			0.84874
Private Placement [Member] | Warrant [Member]
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right | shares		1	1
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares		$ 2.22	$ 2.22
Class of Warrant or Right, Term		5 years
Warrant Expense						$ 10,200,000
Series A Preferred Stock [Member]
Conversion of Stock, Shares Converted | shares				1,926,991
Stock Reclassified Upon Conversion of Preferred Stock				$ 71,000
Stock Reclassified Upon Conversion of Preferred Stock, Shares | shares				25,735
Preferred Stock, Shares Authorized | shares				13,750,000		13,750,000
Fair Value Adjustment of Warrants				$ 23,400,000		$ 23,400,000
Proceeds from Issuance of Private Placement						0
Dividends						$ 546,305
Series A Preferred Stock [Member] | Maximum [Member]
Convertible Preferred Stock, Make-Whole Provision, Minimum Share Price | $ / shares						$ 8
Series A Preferred Stock [Member] | Private Placement [Member]
Private Placement Proceeds, Gross			$ 25,000,000
Number of Convertible Preferred Stock Per Unit | shares		1	1
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right | shares		1	1
Preferred Stock, Dividend Rate, Percentage		8.00%
Number of Common Stock Per Unit | shares		1
Convertible Preferred Stock, Conversion Price | shares		2.02	2.02
Temporary Equity, Stock Issued During Period, New Issues | shares			12,376,329
Private Placement Proceeds, Net			$ 22,100,000
Payments of Stock Issuance Costs			$ 2,900,000					$ 2,900,000
Class of Warrant or Right, Granted During Period | shares			1,179,558
Dividends				$ 500,000		$ 500,000
Series B Preferred Stock [Member]
Number of Convertible Preferred Stock Per Unit | shares	1
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right | shares	1
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares	$ 2.31
Class of Warrant or Right, Term	5 years
Series B Preferred Stock [Member] | Private Placement [Member] | Placement Agent [Member]
Class of Warrant or Right, Granted During Period | shares			1,179,558
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares		$ 2.22	$ 2.22
Class of Warrant or Right, Term		5 years