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Note 7 - Note Payable (Tables)
12 Months Ended
Dec. 31, 2021
The 2017 Loan Agreement [Member]  
Notes Tables  
Schedule of Debt [Table Text Block]

Year Ending December 31,

    

2022

 $- 

2023

  5,992 

Total Payments

  5,992 

Less: Amount representing interest

  (863)

Present value of obligations

  5,129 

Less: Unamortized debt discount

  (5)

Note payable, noncurrent portion

 $5,124