Note 25 - Leases (Details Textual)	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Jan. 01, 2019 USD ($)
Operating Lease, Liability, Total	$ 68,856,000
Operating Lease, Right-of-Use Asset	$ 64,805,000
Lessee, Finance Lease, Number of Leases			0
Lessee, Operating Lease, Number of Leases	37		34
Operating Lease, Weighted Average Remaining Lease Term	19 years 273 days
Operating Lease, Weighted Average Discount Rate, Percent	3.58%
Operating Lease, Expense	$ 4,400,000	$ 4,000,000
Minimum [Member]
Lessee, Operating Lease, Renewal Term	5 years
Maximum [Member]
Lessee, Operating Lease, Renewal Term	10 years
Branch Stores [Member]
Lessee, Operating Lease, Number of Leases	17
Offices [Member]
Lessee, Operating Lease, Number of Leases	7
Leases for Equipment [Member]
Lessee, Operating Lease, Number of Leases	13
Accounting Standards Update 2016-02 [Member]
Operating Lease, Liability, Total			$ 35,100,000
Operating Lease, Right-of-Use Asset			$ 34,200,000