Note 9 - Leases (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Jan. 01, 2019
Operating Lease, Cost	$ 11
Short-term Lease, Cost	3
Operating Lease, Payments	$ 14
Operating Lease, Weighted Average Remaining Lease Term	8 years 10 months 24 days
Operating Lease, Weighted Average Discount Rate, Percent	6.70%
Finance Lease, Weighted Average Remaining Lease Term	2 years
Finance Lease, Weighted Average Discount Rate, Percent	3.50%
Finance Lease, Right-of-Use Asset		$ 2
Finance Lease, Liability, Total		$ 2
Minimum [Member]
Lessee, Term of Contract	1 year
Lessee, Lease, Renewal Term	1 year
Maximum [Member]
Lessee, Term of Contract	99 years
Lessee, Lease, Renewal Term	20 years