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Note 11 - Net Loss Per Share Attributable to Common Stockholders (Tables)
12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
    Year Ended December 31,
    2019   2018
Outstanding stock options    
111
     
114,931
 
Convertible preferred stock    
476,279
     
552,819
 
     
476,390
     
667,750