Note 3 - Segment Reporting Revenue (Details)		3 Months Ended			6 Months Ended
		Jun. 30, 2019 USD ($)		Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($)		Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Revenue Non GAAP Basis		$ 383,501,000		$ 327,546,000	$ 726,187,000		$ 639,025,000
Net gains (losses) on investments and other financial instruments		12,540,000		(7,404,000)	34,453,000		(26,291,000)
Revenues		394,964,000		319,257,000	$ 758,593,000		610,847,000
Increase in Net Premium Earned		32,900,000
Reduction in Other Operating Expense		$ 6,200,000
Percent of LTV at which HPA Must Be Canceled Automatically		0.78			0.78
Unbilled Contracts Receivable		$ 21,725,000			$ 21,725,000			$ 19,917,000
Mortgage Insurance Segment
Revenue Non GAAP Basis		340,520,000	[1]	287,036,000	647,159,000	[1]	564,349,000
Mortgage and Real Estate Services Segment
Revenue Non GAAP Basis		42,981,000		40,510,000	79,028,000		74,676,000
Inter-segment revenues	[2]	1,077,000		885,000	2,047,000		1,887,000
Sales Revenue, Services and Other, Net		39,303,000		36,828,000	72,056,000		69,992,000
Provision for Doubtful Accounts					0
Accounts Receivable, Net		16,846,000			16,846,000			15,461,000
Unbilled Contracts Receivable		21,725,000			21,725,000			19,917,000
Deferred Revenue		2,861,000			2,861,000			$ 3,204,000
Mortgage Services | Mortgage and Real Estate Services Segment
Sales Revenue, Services and Other, Net		17,220,000		20,192,000	32,313,000		36,687,000
Real Estate Services | Mortgage and Real Estate Services Segment
Sales Revenue, Services and Other, Net		16,938,000		14,570,000	32,775,000		28,964,000
Title Services | Mortgage and Real Estate Services Segment
Sales Revenue, Services and Other, Net		$ 5,145,000		$ 2,066,000	$ 6,968,000		$ 4,341,000

[1] Includes a cumulative adjustment to unearned premiums recorded in the second quarter of 2019 related to an update to the amortization rates used to recognize revenue for Single Premium Policies, as further described above.

[2] Inter-segment revenues included in the Services segment.