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Note 8 - Paycheck Protection Program Loan (Tables)
 12 Months Ended
Dec. 31, 2020
Notes Tables  
Schedule of Maturities of Long-term Debt [Table Text Block]
Year Ending December 31,
  
 
 
 
2021
   $
938
  
2022
    
426
  
Total payments
    
1,364
  
Less: Amount representing interest
    
(20
 )
Present value of obligations
    
1,344
  
Paycheck Protection Program loan,current portion
    
918
  
Paycheck Protection Program loan, noncurrent portion
   $
425