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Note 7 - Accrued Liabilities
12 Months Ended
Dec. 31, 2018
Notes to Financial Statements  
Accounts Payable and Accrued Liabilities Disclosure [Text Block]
7.
Accrued Liabilities
 
Accrued liabilities consist of the following:
 
   
As of December 31,
 
   
201
8
   
201
7
 
Accrued salaries and other compensation
  $
882
    $
1,072
 
Sales and marketing programs
   
537
     
435
 
Product warranty
   
194
     
245
 
Other accrued liabilities
   
383
     
91
 
Total
  $
1,996
    $
1,843