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Note 8 - Accrued Liabilities (Tables)
9 Months Ended
Sep. 30, 2019
Notes Tables  
Schedule of Accrued Liabilities [Table Text Block]
   
September 30,
   
December 31,
 
   
2019
   
2018
 
                 
Payroll expenses and taxes payable
  $
216,000
    $
269,000
 
Commissions and bonuses payable and general accrued liabilities
   
628,000
     
1,073,000
 
Total accrued liabilities
  $
844,000
    $
1,342,000