Note 8 - Leases - Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Amortization of right-of-use assets	$ 30,977	$ 27,645
Interest on lease liabilities	2,096	1,720
Operating lease cost	272,335	270,042
Sublease income	(12,300)	(10,300)
Total lease costs	$ 293,108	$ 289,107
Weighted-average remaining lease term - financing leases (in years) (Year)	3 years 109 days
Weighted-average remaining lease term - operating leases (in years) (Year)	14 years 328 days
Weighted-average discount rate - financing leases	1.96%
Weighted-average discount rate - operating leases	5.62%