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Note 8 - Accrued Liabilities
6 Months Ended
Jun. 30, 2018
Notes to Financial Statements  
Accounts Payable and Accrued Liabilities Disclosure [Text Block]
8.
Accrued Liabilities
 
As of
June 30, 2018
and
December 31, 2017,
accrued liabilities consisted of the following:
 
   
June 30,
   
December 31,
 
   
2018
   
2017
 
                 
Payroll expenses and tax payable
  $
229,000
    $
232,000
 
Commission and bonuses payable and general accrued liabilities
   
1,505,000
     
1,333,000
 
    $
1,734,000
    $
1,565,000