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Note 9 - Commitments and Contingencies (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   $
1,055
 
2020    
622
 
2021    
130
 
2022    
108
 
2023    
18
 
Total   $
1,933