Note 8 - Equity (Details Textual) - USD ($)	3 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Mar. 27, 2018	Mar. 26, 2018
Preferred Stock, Par or Stated Value Per Share	$ 0.10	$ 0.10
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 3.25	$ 3.65
New Notes Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights			825,144
Class of Warrant or Right, Exercise Price of Warrants or Rights			$ 1.22	$ 2.07
Series E Convertible Preferred Stock [Member]
Preferred Stock, Shares Outstanding, Ending Balance	25,000	25,000
Convertible Preferred Stock, Aggregate Shares Issued upon Conversion	187,500
Convertible Preferred Stock, Conversion Price	$ 4
Preferred Stock, Par or Stated Value Per Share	$ 30
Preferred Stock, Period Following Issuance Date to Initiate Redemption	1 year
Preferred Stock, Dividend Rate, Percentage	5.00%
Dividends Payable	$ 9,349
Series D Convertible Preferred Stock [Member]
Preferred Stock, Shares Outstanding, Ending Balance	605,000	605,000
Convertible Preferred Stock, Aggregate Shares Issued upon Conversion	619,154
Convertible Preferred Stock, Conversion Price	$ 9.77139
Preferred Stock, Dividend Rate, Percentage	5.00%
Dividends Payable	$ 76,592
Preferred Stock, Redemption Price Per Share	$ 10