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Note 9 - Term Loan and Line of Credit Agreements (Tables)
 6 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Long-term Debt Instruments [Table Text Block]
   
June 30, 2018
  
   
Gross Amount
    
Debt Issuance Costs
    
Net Amount
  
Term loan agreement
   $
11,185
     $
(163
 )   $
11,022
  
Less current portion
    
581
      
(19
 )    
562
  
Long-term debt
   $
10,604
     $
(144
 )   $
10,460
  
   
December 31, 2017
  
   
Gross Amount
    
Debt Issuance Costs
    
Net Amount
  
Term loan agreement
   $
11,464
     $
(172
 )   $
11,292
  
Less current portion
    
566
      
(19
 )    
547
  
Long-term debt
   $
10,898
     $
(153
 )   $
10,745
  
Schedule of Maturities of Long-term Debt [Table Text Block]
For the Twelve Month Period Ending June 30,
  
 
 
 
2019
   $
581
  
2020
    
613
  
2021
    
646
  
2022
    
682
  
2023
    
719
  
Thereafter
    
7,944
  
Total
   $
11,185