Note 10 - Leases (Details Textual) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Jan. 01, 2019
Operating Lease, Weighted Average Remaining Lease Term	10 years 328 days
Operating Lease, Weighted Average Discount Rate, Percent	6.75%
Finance Lease, Weighted Average Remaining Lease Term	3 years 146 days
Finance Lease, Weighted Average Discount Rate, Percent	4.50%
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