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Note 11 - Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
2018   $
1,879
 
2019    
1,880
 
2020    
1,916
 
2021    
1,924
 
2022    
1,673
 
2023 and thereafter    
1,311
 
Total   $
10,583