Note 27 - Nonconsolidated Variable Interest Entities - VIE Equity Investments and Receivables (Details) - Variable Interest Entity, Not Primary Beneficiary, Aggregated Disclosure [Member] - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Carrying amount, assets	$ 88,086	$ 6,016
Carrying amount, liabilities	302
Maximum exposure to loss	91,886	7,961
VIE assets	2,925,776	1,439,792
Collateralized Loan Obligations [Member]
Carrying amount, assets	73,266
Carrying amount, liabilities
Maximum exposure to loss	73,266
VIE assets	1,439,442
Private Equity Funds [Member]
Carrying amount, assets	10,396	5,083
Carrying amount, liabilities	207
Maximum exposure to loss	14,196	7,028
VIE assets	346,206	224,835
Other Equity Interests [Member]
Carrying amount, assets	4,424	933
Carrying amount, liabilities	95
Maximum exposure to loss	4,424	933
VIE assets	$ 1,140,128	$ 1,176,148