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Note 8 - Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
Year
 
Minimum Rental
Commitments
 
2018
  $
1,243
 
2019
   
1,122
 
2020
   
994
 
2021
   
984
 
2022
   
984
 
Thereafter
   
4,074
 
Total
  $
9,401