Note 11 - Losses and LAE - Additional Disclosures: Claims Development (Details) $ in Thousands	Dec. 31, 2020 USD ($) payment default	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)
Claims Development [Line Items]
Number Of Payments Missed For Insured Loans | payment	2
Property, Liability and Casualty Insurance Product Line
Claims Development [Line Items]
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 3,636,200
Short-duration Insurance Contracts, Accident Year 2011 | Property, Liability and Casualty Insurance Product Line
Claims Development [Line Items]
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	1,062,826	$ 1,064,054	$ 1,060,376	$ 1,059,116	$ 1,061,161	$ 1,062,579	$ 1,050,555	$ 1,052,277	$ 1,152,016	$ 1,058,625
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 578
Short-duration Insurance Contract, Cumulative Number of Reported Claims | default	117,019
Short-duration Insurance Contracts, Accident Year 2012 | Property, Liability and Casualty Insurance Product Line
Claims Development [Line Items]
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 713,146	713,839	713,750	714,783	715,646	720,502	711,213	763,969	$ 803,831
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 313
Short-duration Insurance Contract, Cumulative Number of Reported Claims | default	88,555
Short-duration Insurance Contracts, Accident Year 2013 | Property, Liability and Casualty Insurance Product Line
Claims Development [Line Items]
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 399,317	399,356	400,243	402,259	404,333	401,444	405,334	$ 505,732
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 150
Short-duration Insurance Contract, Cumulative Number of Reported Claims | default	70,723
Short-duration Insurance Contracts, Accident Year 2014 | Property, Liability and Casualty Insurance Product Line
Claims Development [Line Items]
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 261,377	261,507	260,098	264,620	265,891	247,074	$ 337,784
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 73
Short-duration Insurance Contract, Cumulative Number of Reported Claims | default	57,541
Short-duration Insurance Contracts, Accident Year 2015 | Property, Liability and Casualty Insurance Product Line
Claims Development [Line Items]
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 184,066	183,546	183,952	178,042	198,186	$ 222,555
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 69
Short-duration Insurance Contract, Cumulative Number of Reported Claims | default	49,255
Short-duration Insurance Contracts, Accident Year 2016 | Property, Liability and Casualty Insurance Product Line
Claims Development [Line Items]
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 148,640	148,811	149,753	165,440	$ 201,016
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 75
Short-duration Insurance Contract, Cumulative Number of Reported Claims | default	45,824
Short-duration Insurance Contracts, Accident Year 2017 | Property, Liability and Casualty Insurance Product Line
Claims Development [Line Items]
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 130,274	133,357	151,802	$ 180,851
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 144
Short-duration Insurance Contract, Cumulative Number of Reported Claims | default	46,956
Short-duration Insurance Contracts, Accident Year 2018 | Property, Liability and Casualty Insurance Product Line
Claims Development [Line Items]
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 95,534	116,634	$ 131,513
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 279
Short-duration Insurance Contract, Cumulative Number of Reported Claims | default	39,341
Short-duration Insurance Contracts, Accident Year 2019 | Property, Liability and Casualty Insurance Product Line
Claims Development [Line Items]
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 136,860	$ 143,475
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 809
Short-duration Insurance Contract, Cumulative Number of Reported Claims | default	42,884
Short-duration Insurance Contracts, Accident Year 2020 | Property, Liability and Casualty Insurance Product Line
Claims Development [Line Items]
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 504,160
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 4,540
Short-duration Insurance Contract, Cumulative Number of Reported Claims | default	109,411