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Note 9 - Commitments and Contingencies (Tables)
9 Months Ended
Sep. 30, 2018
Notes Tables  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
Year ended December 31,
(in thousands)
 
 
 
 
2018 (October 1 – December 31)
  $
120
 
2019
   
478
 
2020
   
462
 
2021
   
242
 
2022
   
44
 
Total minimum lease payments
  $
1,346