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Note 15 - Basic and Diluted Net Loss Per Share (Tables)
12 Months Ended
Dec. 31, 2022
Notes Tables  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
   

December 31,

 
   

2022

   

2021

 

Stock options

    7,584,967       4,640,660  

Stock warrants

    1,021,076       1,120,300  

Nonvested restricted stock units

    8,483,491       3,839,030  

Total

    17,089,534       9,599,990