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Note 12 - Investments in Affiliates (Details Textual) $ in Thousands	9 Months Ended
	Sep. 30, 2020 USD ($)	Jun. 30, 2020	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)
Assets, Total	$ 2,488,273		$ 2,502,088	$ 2,612,660
Equity Method Investment, Other than Temporary Impairment	$ 9,600
Foreign Affiliates [Member]
Number of Entities	13
Equity Method Investment, Other than Temporary Impairment	$ 9,600
Foreign Affiliates [Member] | Minimum [Member]
Assets, Total	$ 100
Equity Method Investment, Ownership Percentage	25.00%
Foreign Affiliates [Member] | Maximum [Member]
Assets, Total	$ 66,000
Equity Method Investment, Ownership Percentage	50.00%
Real Estate Entities [Member]
Assets, Total	$ 31,600
Number of Entities	3
Real Estate Entities [Member] | Minimum [Member]
Assets, Total	$ 8,100
Equity Method Investment, Ownership Percentage		18.00%
Real Estate Entities [Member] | Maximum [Member]
Assets, Total	35,700
Equity Method Investment, Ownership Percentage		47.00%
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]
Assets, Total	282,004		287,679	309,202
Real Estate Entities [Member]
Assets, Total	$ 13,200		$ 13,600	$ 14,100

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