Note 12 - Investments in Affiliates (Details Textual) $ in Thousands	Sep. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)		Sep. 30, 2021 USD ($)
Assets, Total	$ 2,407,964	$ 2,494,927		$ 2,561,756
Real Estate Entities [Member]
Number of Entities	2
Real Estate Entities [Member] | Minimum [Member]
Equity Method Investment, Ownership Percentage	10.00%
Real Estate Entities [Member] | Maximum [Member]
Equity Method Investment, Ownership Percentage	25.00%
Foreign Affiliates [Member] | Minimum [Member]
Equity Method Investment, Ownership Percentage	25.00%
Foreign Affiliates [Member] | Maximum [Member]
Equity Method Investment, Ownership Percentage	50.00%
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]
Assets, Total	$ 357,131	$ 113,203	[1]	$ 324,203
Real Estate Entities [Member]
Assets, Total	72,600
Foreign Affiliates [Member]
Assets, Total	251,000
Asphalt Terminal Entity [Member]
Assets, Total	$ 33,500

[1] These balances do not include amounts held for sale (see Note 3).