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Note 11 - Paycheck Protection Program (PPP) Loan (Tables)
 3 Months Ended
Mar. 31, 2021
Notes Tables  
Schedule of Debt [Table Text Block]
   
March 31, 2021
    
December 31, 2020
  
PPP Loan, .98%, due April 2022:
                
Principal
   $
1,572
     $
1,572
  
Accrued interest
    
16
      
12
  
    $
1,588
     $
1,584
  
                 
PPP Loan payable:
                
Current portion   $
1,588
      
950
  
Long-term portion    
—
      
634
  
    $
1,588
     $
1,584