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Note 3 - Accrued Liabilities (Tables)
6 Months Ended
Jun. 30, 2020
Notes Tables  
Schedule of Accrued Liabilities [Table Text Block]
  

June 30, 2020

  

December 31, 2019

 

Accrued compensation expenses

 $6,703  $10,100 

Accrued other

  2,683   3,634 

Total accrued liabilities

 $9,386  $13,734