Annual report pursuant to Section 13 and 15(d)

Note 1 - The Company and Summary of Significant Accounting Policies (Details)

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Note 1 - The Company and Summary of Significant Accounting Policies (Details) - shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Anti-dilutive securities 86,970,470 8,682,368
Exercise of common stock warrants    
Anti-dilutive securities 9,065,265 1,813,053
Conversion of preferred stock into common stock    
Anti-dilutive securities 11,768,295 1,163,659
Conversion of convertible debentures into common stock    
Anti-dilutive securities 66,136,870 5,704,543
Exercise of common stock options    
Anti-dilutive securities 40 1,113