Note 6 - Unearned Revenue - Schedule of Unearned Revenue (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021
Unearned Revenue	$ 2,491,537	$ 2,595,085	$ 3,171,552
CALIFORNIA
Unearned Revenue	768,013	771,759	834,815
Central [Member]
Unearned Revenue	1,192,812	1,334,901	1,798,761
Mountain [Member]
Unearned Revenue	$ 530,712	$ 488,425	$ 537,976