Note 11 - Leases (Details Textual) - USD ($) $ in Millions		12 Months Ended
	Feb. 15, 2019	Dec. 31, 2019
Operating Lease, Weighted Average Remaining Lease Term		4 years 2 months 12 days
Operating Lease, Weighted Average Discount Rate, Percent		3.46%
Operating Lease, Payments		$ 44.5
Operating Lease, Expense		43.5
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability		$ 61.6
Cory 1st Choice Home Delivery [Member]
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	$ 19.1