Note 8 - Preferred Stock and Warrants (Details Textual) - $ / shares	1 Months Ended	12 Months Ended
	Aug. 31, 2016	Dec. 31, 2015	Sep. 30, 2016
Series A Preferred Stock [Member]
Preferred Stock, Shares Issued			14,360
Stock Redeemed or Called During Period, Shares	3,661	9,979
Preferred Stock, Redemption Price Per Share	$ 1,000	$ 1,000
Preferred Stock, Shares Issued		18,021	14,360
Class of Warrant or Right, Number of Securities Called by Warrants or Rights			500,000
Preferred Stock, Liquidation Preference Per Share			$ 1,000
Class of Warrant or Right, Exercise Price of Warrants or Rights			$ 8.40