Note 2 - Ownership Interests and Advances - Schedule of Carrying Value of Ownership Interests (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Equity Method Companies	$ 18,855	$ 21,208
Ownership interests	2,407	4,549
Other Method, fair value measurement alternative	3,344	5,313
Advances to companies	3,400	0
Investments and Advances to Affiliates, Current and Noncurrent	25,599	26,521
Partnership Interest [Member]
Equity Method Companies	18,738	21,091
Ownership interests	2,407	4,549
Other Method, fair value measurement alternative	687	514
Private Equity Funds [Member]
Equity Method Companies	117	117
Other Method, fair value measurement alternative	$ 250	$ 250