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Note 4 - Long-term Borrowings (Tables)
12 Months Ended
Dec. 31, 2021
Notes Tables  
Schedule of Long-term Debt Instruments [Table Text Block]
  

December 31,

 
  

2021

  

2020

 

Notes Payable due July, 2022

 $1,595  $1,995 

Accrued in-kind interest – long term

  450   370 

Less unamortized discount and debt issuance costs

  (22

)

  (131

)

   2,023   2,234 

Current portion of long-term borrowing

  2,023   - 

Non-current portion of long-term borrowing

 $-  $2,234 
Contractual Obligation, Fiscal Year Maturity [Table Text Block]

2022

 $1,595 

Total

 $1,595