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Note 13 - Subsequent Events (Details Textual) - Subsequent Event [Member]
1 Months Ended
Jul. 31, 2020
shares
Series H and Series I Warrants [Member]  
Class of Warrant or Right, Exercised During Period (in shares) 1,091,128
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) 738,048
Conversion of Series J Preferred Stock To Common Stock [Member]  
Conversion of Stock, Shares Converted (in shares) 300
Conversion of Stock, Shares Issued (in shares) 854,458