Note 7 - Leases (Details Textual) - USD ($)	3 Months Ended
	Mar. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Operating Lease, Right-of-Use Asset	$ 104,177,000
Operating Lease, Liability, Total	$ 97,133,000
Operating Lease, Weighted Average Remaining Lease Term	21 years 36 days
Operating Lease, Weighted Average Discount Rate, Percent	6.59%
Maximum [Member]
Lessee, Operating Lease, Remaining Term of Contract	53 years
Lessee, Operating Lease, Renewal Term	75 years
Accounting Standards Update 2016-02 [Member]
Operating Lease, Right-of-Use Asset	$ 106,000,000	$ 106,000,000
Operating Lease, Liability, Total	$ 98,700,000	$ 98.70