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Note 6 - Leases and Deferred Rent (Tables)
12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
Years ending December 31,
 
 
 
 
2018
  $
762
 
2019
   
412
 
2020
   
182
 
2021
   
187
 
2022
   
193
 
Thereafter
   
472
 
Total minimum lease payments
  $
2,208