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Note 12 - Investments in Affiliates (Details Textual) $ in Thousands	6 Months Ended
	Jun. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)	Jun. 30, 2019 USD ($)
Assets, Total	$ 2,508,654	$ 2,502,088	$ 2,524,617
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]
Equity Method Investment, Ownership Percentage	25.00%
Foreign Affiliates [Member] | Maximum [Member]
Equity Method Investment, Ownership Percentage	50.00%
Real Estate Entities [Member]
Assets, Total	$ 28,600
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	$ 35,100
Equity Method Investment, Ownership Percentage	47.00%
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]
Assets, Total	$ 286,398	287,679	321,125
Foreign Affiliates [Member] | Minimum [Member]
Assets, Total	200
Foreign Affiliates [Member] | Maximum [Member]
Assets, Total	72,200
Real Estate Entities [Member]
Assets, Total	$ 13,200	$ 13,600	$ 14,200

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