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Note 15 - 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,
 
Operating
Leases
 
2019
 
$
1,051
 
 
2020
 
 
1,070
 
 
2021
 
 
1,063
 
 
2022
 
 
975
 
 
2023
 
 
36
 
 
Total minimum lease payments
 
$
4,195