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Note 4 - Segment Reporting - Adjusted Pretax Operating Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Adjusted pretax operating income (loss)	$ 163,834	$ 202,514
Net gains (losses) on investments and other financial instruments	(5,181)	(22,027)
Amortization and impairment of other acquired intangible assets	(862)	(979)
Consolidated pretax income (loss)	161,189	181,293
Segment Reconciling Items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net gains (losses) on investments and other financial instruments	(5,181)	(22,027)
Amortization and impairment of other acquired intangible assets	(862)	(979)
Impairment of other long-lived assets and other-non-operating items	(84)	(300)
Mortgage segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Adjusted pretax operating income (loss)	174,287	205,667
Total Operating Expenses Allocated to Subsidiaries From Parent Company	27,884	29,214
Depreciation	1,810	3,270
Real Estate segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Adjusted pretax operating income (loss)	(10,453)	(3,153)
Total Operating Expenses Allocated to Subsidiaries From Parent Company	3,996	3,367
Depreciation	454	610
All Other activities segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Adjusted pretax operating income (loss)	$ 3,482	$ 2,085

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