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Note 4 - Accrued Expenses (Tables)
12 Months Ended
Dec. 31, 2021
Notes Tables  
Schedule of Accrued Liabilities [Table Text Block]
  

2021

  

2020

 
Accrued license fees – current $3,000,000  $- 
Accrued license fees – noncurrent  2,000,000   - 

Accrued payroll

  269,000   279,696 

Other accrued expenses

  108,826   79,585 

Total accrued expenses

 $5,377,826  $359,281