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Note 8 - Lease - Lease Obligations (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Amortization of right-of-use assets $ 968 $ 1,408 $ 2,005 $ 2,819
Interest on lease liabilities 278 206 525 433
Operating lease cost 7,445 5,475 14,047 11,657
Variable lease cost 156 0 314 0
Total lease cost 8,847 7,089 16,891 14,909
Operating cash flows from finance leases 968 1,297 2,005 2,443
Operating cash flows from operating leases 7,601 5,475 14,361 11,657
Financing cash flows from finance leases 278 206 525 433
Right-of-use assets obtained in exchange for new finance lease liabilities 2,127 0 2,127 0
Right-of-use assets obtained in exchange for new operating lease liabilities $ 2,176 $ 3,089 $ 2,637 $ 6,325
Weighted-average remaining lease term—finance leases (Year) 2 years 4 months 24 days   2 years 4 months 24 days  
Weighted-average remaining lease term—operating leases (Year) 2 years 8 months 12 days   2 years 8 months 12 days  
Weighted-average discount rate—finance leases 3.30%   3.30%  
Weighted-average discount rate—operating leases 5.20%   5.20%