Note 2 - Ownership Interests and Advances - Schedule of Carrying Value of Ownership Interests (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Equity Method Companies	$ 10,680	$ 8,846
Ownership interests	0	860
Other Method, fair value measurement alternative	2,805	2,177
Advances to companies	1,354	4,382
Investments and Advances to Affiliates, Current and Noncurrent	14,839	15,405
Partnership Interest [Member]
Equity Method Companies	10,583	8,749
Ownership interests	0	860
Other Method, fair value measurement alternative	2,555	1,067
Private Equity Funds [Member]
Equity Method Companies	97	97
Other Method, fair value measurement alternative	$ 250	$ 250