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Note 10 - Financing Obligations (Tables)
12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Debt [Table Text Block]
       
   
December 31,
 
(in thousands)
 
2017
   
2016
 
                 
Revolving Credit Facility, with interest rates from 2.50% to 2.56%, due at maturity in November 2019
  $
5,000
    $
-
 
Total Financing Obligations
  $
5,000
    $
-