Note 14 - Stockholders' Equity (Details Textual)	Nov. 17, 2017	Dec. 31, 2018 shares
Series B Convertible Preferred Stock [Member]
Convertible Preferred Stock, Shares Issued upon Conversion		20
Reverse Stock Split [Member]
Stockholders' Equity Note, Stock Split, Conversion Ratio	30

Number of shares issued for each share of convertible preferred stock that is converted.

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