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Lease Obligations - Summary of the lease terms and discount rates (Details)
Mar. 31, 2020
Dec. 31, 2019
Lease Obligations    
Weighted-average remaining lease term - finance leases 1 year 1 month 6 days 1 year 4 months 24 days
Weighted-average remaining lease term - operating leases 3 years 9 months 18 days 3 years 10 months 24 days
Weighted-average discount rate - finance leases 2.50% 2.50%
Weighted-average discount rate - operating leases 3.80% 3.80%