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Note 8 - Leases (Tables)
9 Months Ended
Sep. 30, 2018
Notes Tables  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
Period ending September 30:
       
2019
  $
3,335
 
2020
   
2,702
 
2021
   
2,781
 
2022
   
2,862
 
2023
   
2,946
 
Thereafter
   
4,026
 
Total future minimum lease payments
  $
18,652