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Note 6 - Note Payable (Tables)
3 Months Ended
Mar. 31, 2022
The 2017 Loan Agreement [Member]  
Notes Tables  
Schedule of Debt [Table Text Block]

Year Ending December 31,

    

2022 (remaining nine months)

 $- 

2023

  5,992 

Total payments

  5,992 

Less: Amount representing interest

  (703)

Present value of obligations

  5,289 

Less: Unamortized debt discount

  (4)

Note payable, current portion

 $5,285