Note 5 - Unearned Revenue - Schedule of Unearned Revenue (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Unearned Revenue	$ 2,595,085	$ 2,810,827
CALIFORNIA
Unearned Revenue	771,759	816,082
Central [Member]
Unearned Revenue	1,334,901	1,482,158
Mountain [Member]
Unearned Revenue	$ 488,425	$ 512,587