Note 6 - Unearned Revenue - Schedule of Unearned Revenue (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Unearned Revenue	$ 3,163,568	$ 2,877,478
CALIFORNIA
Unearned Revenue	1,011,489	945,971
Central [Member]
Unearned Revenue	1,437,759	1,444,983
Mountain [Member]
Unearned Revenue	$ 714,320	$ 486,524