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Note 5 - Notes Payable (Tables)
 9 Months Ended
Sep. 30, 2019
Notes Tables  
Schedule of Debt [Table Text Block]
   
September 30,
2019
    
December 31,
2018
  
Term Loans
   $
35,229
     $
37,996
  
Less: current portion
    
(4,133
)
    
(3,667
)
Less: unamortized debt issuance costs
    
(119
)
    
(153
)
Notes payable, net of current portion
   $
30,977
     $
34,176