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Note 1 - Description of Business and Summary of Significant Accounting Policies (Tables)
3 Months Ended
Mar. 31, 2021
Notes Tables  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
   
Three Months Ended March 31,
 
   
2021
   
2020
 
Stock options
   
163,393
     
1,574,500
 
Restricted stock units
   
108,828
     
74,981