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Note 8 - Leases - Lease Costs (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jul. 01, 2018
Amortization of right-of-use assets $ 278 $ 424
Interest on lease liabilities 11 19
Operating lease cost 5,930 11,601
Short-term lease cost 408 1,146
Variable lease cost 613 758
Total lease cost 7,240 13,948
Operating cash flows from finance leases 11 19
Operating cash flows from operating leases 5,395 10,505
Financing cash flows from finance leases 271 517
Right-of-use assets obtained in exchange for new finance lease liabilities 551 551
Right-of-use assets obtained in exchange for new operating lease liabilities $ 4,069 $ 6,536
Weighted-average remaining lease term – finance leases (in years) (Year) 2 years 3 months 18 days  
Weighted-average remaining lease term – operating leases (in years) (Year) 10 years 10 months 9 days  
Weighted-average discount rate – finance leases 1.98%  
Weighted-average discount rate – operating leases 5.83%