Note 5 - Unearned Revenue - Schedule of Unearned Revenue (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	[1]
Unearned Revenue	$ 2,877,478	$ 2,595,085
CALIFORNIA
Unearned Revenue	945,971	771,759
Central [Member]
Unearned Revenue	1,444,983	1,334,901
Mountain [Member]
Unearned Revenue	$ 486,524	$ 488,425

[1] These balances do not include amounts held for sale (see Note 2).