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Note 6 - Leases and Deferred Rent (Tables)
12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
Years ending December 31,
 
 
 
 
2019
  $
809
 
2020
   
700
 
2021
   
646
 
2022
   
595
 
2023
   
606
 
Thereafter
   
375
 
Total minimum lease payments
  $
3,731