Note 11 - Leases (Details Textual) - USD ($) $ in Millions			12 Months Ended
	Nov. 30, 2020	Feb. 15, 2019	Dec. 31, 2020	Dec. 31, 2019
Operating Lease, Weighted Average Remaining Lease Term (Year)			4 years 3 months 18 days
Operating Lease, Weighted Average Discount Rate, Percent			3.05%
Operating Lease, Payments			$ 49.7	$ 44.5
Operating Lease, Expense			50.2	43.5
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability			$ 57.0	$ 61.6
Mass Movement, Inc. [Member]
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	$ 4.4
Cory 1st Choice Home Delivery [Member]
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability		$ 19.1