Note 6 - Fair Value Measurements and Fair Value of Financial Instruments (Details Textual) - Collateral Pledged [Member] - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Impaired Financing Receivable, with Related Allowance, Recorded Investment	$ 48.6	$ 54.1
Impaired Financing Receivable, Related Allowance	$ 17.0	$ 17.8

Amount of investment in impaired financing receivables for which there is a related allowance for credit losses.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 14A
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953550-111524

Name:	us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant