Note 4 - Segment Reporting - Adjusted Pretax Operating Income (Loss) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Adjusted pretax operating income (loss)	$ 139,895	$ 207,060	$ 247,557	$ 617,704
Net gains (losses) on investments and other financial instruments	17,652	13,009	42,901	47,462
Gain (Loss) on Extinguishment of Debt	0	(5,940)	0	(22,738)
Amortization and impairment of other acquired intangible assets	(961)	(2,139)	(2,919)	(6,465)
Impairment of other long-lived assets and other-non-operating items	(466)	0	(788)	(5,557)
Consolidated pretax income (loss)	161,205	217,673	300,274	643,354
Increase in Net Premiums Earned				$ 32,900
Increase in Net Premiums Earned Per Share				$ 0.12
Mortgage segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Adjusted pretax operating income (loss)	145,836	209,601	263,182	$ 627,942
Total Operating Expenses Allocated to Subsidiaries From Parent Company	29,435	26,671	83,700	76,684
Depreciation	2,895	3,817	9,719	11,528
Real Estate segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Adjusted pretax operating income (loss)	(5,941)	(2,541)	(15,625)	(10,238)
Total Operating Expenses Allocated to Subsidiaries From Parent Company	3,818	2,910	10,993	8,364
Depreciation	683	561	2,125	1,769
All Other activities segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Adjusted pretax operating income (loss)	$ 5,085	$ 5,683	$ 13,523	$ 12,948