Note 5 - Loans - Loans Modified and Classified as TDR (Details) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jun. 30, 2018	Jun. 30, 2017 USD ($)
Financing Receivable, Modifications, Number of Contracts	0	0	5
Financing Receivable, Modifications, Balance			$ 4,289
Taxi Medallion Portfolio Segment [Member] \| Interest Rate Below Market Reduction [Member]
Financing Receivable, Modifications, Number of Contracts			5
Financing Receivable, Modifications, Balance			$ 4,289

Post-modification amount of investment in financing receivables modified by troubled debt restructurings.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524

Name:	us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration