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Note 8 - Leases (Tables)
6 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
Period ending June 30:
       
2019
  $
3,320
 
2020
   
2,686
 
2021
   
2,764
 
2022
   
2,845
 
2023
   
2,928
 
Thereafter
   
4,654
 
Total future minimum lease payments
  $
19,197