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Note 4 - Accrued Expenses
12 Months Ended
Dec. 31, 2020
Notes to Financial Statements  
Accounts Payable and Accrued Liabilities Disclosure [Text Block]
4.
Accrued Expenses
 
Accrued expenses consist of the following (in thousands):
 
    As of December 31,  
    2020     2019  
Accrued compensation and employee benefits   $
315
    $
450
 
Accrued vacation expense    
379
     
399
 
Accrued taxes    
4
     
564
 
Accrued shipping expense    
511
     
368
 
Accrued payables for equipment and leasehold improvements    
-
     
1,453
 
Other accrued expenses    
592
     
343
 
  Total Accrued Expenses   $
1,801
    $
3,577