Note 9 - Other Assets - Components of Other Assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2021	Sep. 30, 2021	Dec. 31, 2020
Prepaid federal income taxes (Note 10)		$ 313,123	$ 210,889
Prepaid Reinsurance Premiums		209,769	267,638
Loaned securities (Note 5)		135,058	57,499
Company-owned life insurance		112,503	115,586
Right-of-use assets (Note 13)		32,690	32,985
Other		35,918	30,488
Other Assets		839,061	$ 715,085
Impairment of Leasehold	$ 3,500
Corporate headquarters
Right-of-use assets (Note 13)		$ 27,400