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Note 8 - Accrued Liabilities
3 Months Ended
Mar. 31, 2020
Notes to Financial Statements  
Accounts Payable and Accrued Liabilities Disclosure [Text Block]
8
.
Accrued Liabilities
 
As of
March 31, 2020
and
December 31, 2019,
accrued liabilities consisted of the following:
 
   
March 31,
   
December 31,
 
   
2020
   
2019
 
                 
Payroll expenses and taxes payable
  $
148,000
    $
299,000
 
Commissions and bonuses payable and general accrued liabilities
   
616,000
     
621,000
 
Total accrued liabilities
  $
764,000
    $
920,000