Note 10 - Commitments and Contingencies (Details Textual) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021
Assets, Total	$ 2,116,454	$ 1,943,863	$ 1,419,851
Asset Pledged as Collateral [Member] | Contractual Obligations [Member]
Assets, Total	24,900
Unfunded Individual Credit Commitment [Member]
Other Commitment, Total	2,200,000
Unfunded Outstanding Floor-Plan Financing Commitment [Member]
Other Commitment, Total	12,600,000
Credit Protection Program [Member]
Loss Contingency, Estimate of Possible Loss	$ 73,300