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Note 8 - Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2015
Notes Tables  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
Year ended December 31,
(in thousands)
 
 
 
 
2016
  $ 351  
2017
    257  
2018
    64  
Total minimum lease payments
  $ 672