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Note 3 - Term Loan and Line of Credit Agreements (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Long-term Debt Instruments [Table Text Block]
   
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
  
   
2016
  
   
Gross Amount
    
Debt Issuance Costs
    
Net Amount
  
Term loan agreement
   $
12,000
     $
(189
 )   $
11,811
  
Less current portion
    
536
      
(19
 )    
517
  
Long-term debt
   $
11,464
     $
(170
 )   $
11,294
  
Schedule of Maturities of Long-term Debt [Table Text Block]
201
8
   $
566
  
201
9
    
597
  
202
0
    
629
  
202
1
    
664
  
202
2
    
700
  
Thereafte
r
    
8,308
  
Tota
l
   $
11,464