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Note 5 - Notes Payable (Tables)
 6 Months Ended
Jun. 30, 2019
Notes Tables  
Schedule of Debt [Table Text Block]
   
June 30, 2019
    
December 31, 2018
  
Term Loans
   $
36,159
     $
37,996
  
Less: current portion
    
(3,890
)
    
(3,667
)
Less: unamortized debt issuance costs
    
(130
)
    
(153
)
Notes payable, net of current portion
   $
32,139
     $
34,176