Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Earnest Money Deposits	$ 14,300	$ 6,400
Contract with Customer, Asset, after Allowance for Credit Loss, Total	46,600	34,800
Depreciation, Depletion and Amortization, Total	22,800	20,500	$ 4,500
Goodwill, Impairment Loss	0	0
Derivative, Notional Amount	108,500	65,500
Loans Receivable Held-for-sale, Net, Not Part of Disposal Group, Ending Balance	58,500	17,800
Derivative, Gain (Loss) on Derivative, Net, Total	300	400	(1,700)
Gain (Loss) on Sale of Mortgage Loans	55,300	41,600	$ 39,000
Interest Rate Lock Commitments [Member]
Derivative, Notional Amount	$ 104,500	$ 101,100
Derivative, Average Fixed Interest Rate	3.72%	4.78%
Minimum [Member]
Property, Plant and Equipment, Useful Life	2 years
Maximum [Member]
Property, Plant and Equipment, Useful Life	29 years