Note 9 - Subsequent Events (Details Textual) - Series A Convertible Preferred Stock [Member] - Subsequent Event [Member] $ / shares in Units, $ in Millions	Aug. 02, 2017 USD ($) $ / shares shares
Stock Issued During Period, Shares, New Issues	22,000
Shares Issued, Price Per Share | $ / shares	$ 1,000
Proceeds from Issuance of Convertible Preferred Stock | $	$ 22.0
Common Stock [Member]
Convertible Preferred Stock, Shares Issued upon Conversion	1,005
Convertible Preferred Stock, Conversion Price of Shares Issued upon Conversion | $ / shares	$ 0.9949
Convertible Preferred Stock, Number of Shares Issued upon Conversion	22,112,775