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Note 7 - Commitments and Contingencies (Tables)
6 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
Year Ending December 31,
 
 
 
 
2018 (remaining six months)
  $
130
 
2019
   
264
 
2020
   
112
 
Total minimum lease payments
  $
506