Note 4 - Loans Receivable - Aging of the Recorded Investment of Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Loans receivable	$ 1,061,377	$ 1,050,638
Financial Asset, 30 to 59 Days Past Due [Member]
Loans receivable	21,649	6,876
Financial Asset, 60 to 89 Days Past Due [Member]
Loans receivable	36	6,188
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans receivable	1,962	750
Financial Asset, Past Due [Member]
Loans receivable	23,647	13,814
Financial Asset, Not Past Due [Member]
Loans receivable	1,037,730	1,036,824
Real Estate Portfolio [Member] \| One-to-Four Family Residential Real Estate, Owner Occupied [Member]
Loans receivable	22,715	24,131
Real Estate Portfolio [Member] \| One-to-Four Family Residential Real Estate, Owner Occupied [Member] \| Financial Asset, 30 to 59 Days Past Due [Member]
Loans receivable	497	181
Real Estate Portfolio [Member] \| One-to-Four Family Residential Real Estate, Owner Occupied [Member] \| Financial Asset, 60 to 89 Days Past Due [Member]
Loans receivable	17	250
Real Estate Portfolio [Member] \| One-to-Four Family Residential Real Estate, Owner Occupied [Member] \| Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans receivable	330	367
Real Estate Portfolio [Member] \| One-to-Four Family Residential Real Estate, Owner Occupied [Member] \| Financial Asset, Past Due [Member]
Loans receivable	844	798
Real Estate Portfolio [Member] \| One-to-Four Family Residential Real Estate, Owner Occupied [Member] \| Financial Asset, Not Past Due [Member]
Loans receivable	21,871	23,333
Real Estate Portfolio [Member] \| One-to-Four Family Residential Real Estate, Non-owner Occupied [Member]
Loans receivable	5,506	6,002
Real Estate Portfolio [Member] \| One-to-Four Family Residential Real Estate, Non-owner Occupied [Member] \| Financial Asset, 30 to 59 Days Past Due [Member]
Loans receivable	87	2
Real Estate Portfolio [Member] \| One-to-Four Family Residential Real Estate, Non-owner Occupied [Member] \| Financial Asset, 60 to 89 Days Past Due [Member]
Loans receivable	0	9
Real Estate Portfolio [Member] \| One-to-Four Family Residential Real Estate, Non-owner Occupied [Member] \| Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans receivable	0	0
Real Estate Portfolio [Member] \| One-to-Four Family Residential Real Estate, Non-owner Occupied [Member] \| Financial Asset, Past Due [Member]
Loans receivable	87	11
Real Estate Portfolio [Member] \| One-to-Four Family Residential Real Estate, Non-owner Occupied [Member] \| Financial Asset, Not Past Due [Member]
Loans receivable	5,419	5,991
Real Estate Portfolio [Member] \| Multi-family Mortgage [Member]
Loans receivable	435,522	426,136
Real Estate Portfolio [Member] \| Multi-family Mortgage [Member] \| ILLINOIS
Loans receivable	251,322	235,870
Real Estate Portfolio [Member] \| Multi-family Mortgage [Member] \| Other [Member]
Loans receivable	184,200	190,266
Real Estate Portfolio [Member] \| Multi-family Mortgage [Member] \| Financial Asset, 30 to 59 Days Past Due [Member] \| ILLINOIS
Loans receivable	188	189
Real Estate Portfolio [Member] \| Multi-family Mortgage [Member] \| Financial Asset, 30 to 59 Days Past Due [Member] \| Other [Member]
Loans receivable	1,040	0
Real Estate Portfolio [Member] \| Multi-family Mortgage [Member] \| Financial Asset, 60 to 89 Days Past Due [Member] \| ILLINOIS
Loans receivable	0	0
Real Estate Portfolio [Member] \| Multi-family Mortgage [Member] \| Financial Asset, 60 to 89 Days Past Due [Member] \| Other [Member]
Loans receivable	0	0
Real Estate Portfolio [Member] \| Multi-family Mortgage [Member] \| Financial Asset, Equal to or Greater than 90 Days Past Due [Member] \| ILLINOIS
Loans receivable	0	0
Real Estate Portfolio [Member] \| Multi-family Mortgage [Member] \| Financial Asset, Equal to or Greater than 90 Days Past Due [Member] \| Other [Member]
Loans receivable	0	0
Real Estate Portfolio [Member] \| Multi-family Mortgage [Member] \| Financial Asset, Past Due [Member] \| ILLINOIS
Loans receivable	188	189
Real Estate Portfolio [Member] \| Multi-family Mortgage [Member] \| Financial Asset, Past Due [Member] \| Other [Member]
Loans receivable	1,040	0
Real Estate Portfolio [Member] \| Multi-family Mortgage [Member] \| Financial Asset, Not Past Due [Member] \| ILLINOIS
Loans receivable	251,134	235,681
Real Estate Portfolio [Member] \| Multi-family Mortgage [Member] \| Financial Asset, Not Past Due [Member] \| Other [Member]
Loans receivable	183,160	190,266
Real Estate Portfolio [Member] \| Nonresidential Real Estate [Member]
Loans receivable	99,817	103,172
Real Estate Portfolio [Member] \| Nonresidential Real Estate [Member] \| Financial Asset, 30 to 59 Days Past Due [Member]
Loans receivable	0	0
Real Estate Portfolio [Member] \| Nonresidential Real Estate [Member] \| Financial Asset, 60 to 89 Days Past Due [Member]
Loans receivable	0	0
Real Estate Portfolio [Member] \| Nonresidential Real Estate [Member] \| Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans receivable	0	297
Real Estate Portfolio [Member] \| Nonresidential Real Estate [Member] \| Financial Asset, Past Due [Member]
Loans receivable	0	297
Real Estate Portfolio [Member] \| Nonresidential Real Estate [Member] \| Financial Asset, Not Past Due [Member]
Loans receivable	99,817	102,875
Commercial Portfolio Segment [Member]
Loans receivable	496,245	489,512
Commercial Portfolio Segment [Member] \| Commercial Lines and Loans for Operations [Member]
Loans receivable	70,925	67,995
Commercial Portfolio Segment [Member] \| Commercial Lines and Loans for Operations [Member] \| Financial Asset, 30 to 59 Days Past Due [Member]
Loans receivable	2,953	0
Commercial Portfolio Segment [Member] \| Commercial Lines and Loans for Operations [Member] \| Financial Asset, 60 to 89 Days Past Due [Member]
Loans receivable	0	0
Commercial Portfolio Segment [Member] \| Commercial Lines and Loans for Operations [Member] \| Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans receivable	0	0
Commercial Portfolio Segment [Member] \| Commercial Lines and Loans for Operations [Member] \| Financial Asset, Past Due [Member]
Loans receivable	2,953	0
Commercial Portfolio Segment [Member] \| Commercial Lines and Loans for Operations [Member] \| Financial Asset, Not Past Due [Member]
Loans receivable	67,972	67,995
Commercial Portfolio Segment [Member] \| Asset-based and Factored Receivables [Member]
Loans receivable	30,888	19,400
Commercial Portfolio Segment [Member] \| Asset-based and Factored Receivables [Member] \| Financial Asset, 30 to 59 Days Past Due [Member]
Loans receivable	804	26
Commercial Portfolio Segment [Member] \| Asset-based and Factored Receivables [Member] \| Financial Asset, 60 to 89 Days Past Due [Member]
Loans receivable	13	6
Commercial Portfolio Segment [Member] \| Asset-based and Factored Receivables [Member] \| Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans receivable	0	10
Commercial Portfolio Segment [Member] \| Asset-based and Factored Receivables [Member] \| Financial Asset, Past Due [Member]
Loans receivable	817	42
Commercial Portfolio Segment [Member] \| Asset-based and Factored Receivables [Member] \| Financial Asset, Not Past Due [Member]
Loans receivable	30,071	19,358
Finance Leases Portfolio Segment [Member] \| Equipment Finance Leases, Government [Member]
Loans receivable	173,699	178,462
Finance Leases Portfolio Segment [Member] \| Equipment Finance Leases, Government [Member] \| Financial Asset, 30 to 59 Days Past Due [Member]
Loans receivable	8,181	3,160
Finance Leases Portfolio Segment [Member] \| Equipment Finance Leases, Government [Member] \| Financial Asset, 60 to 89 Days Past Due [Member]
Loans receivable	0	4,718
Finance Leases Portfolio Segment [Member] \| Equipment Finance Leases, Government [Member] \| Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans receivable	1,566	0
Finance Leases Portfolio Segment [Member] \| Equipment Finance Leases, Government [Member] \| Financial Asset, Past Due [Member]
Loans receivable	9,747	7,878
Finance Leases Portfolio Segment [Member] \| Equipment Finance Leases, Government [Member] \| Financial Asset, Not Past Due [Member]
Loans receivable	163,952	170,584
Finance Leases Portfolio Segment [Member] \| Investment Rated Commercial Leases [Member]
Loans receivable	74,286	82,626
Finance Leases Portfolio Segment [Member] \| Investment Rated Commercial Leases [Member] \| Financial Asset, 30 to 59 Days Past Due [Member]
Loans receivable	6,097	290
Finance Leases Portfolio Segment [Member] \| Investment Rated Commercial Leases [Member] \| Financial Asset, 60 to 89 Days Past Due [Member]
Loans receivable	0	1,201
Finance Leases Portfolio Segment [Member] \| Investment Rated Commercial Leases [Member] \| Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans receivable	0	0
Finance Leases Portfolio Segment [Member] \| Investment Rated Commercial Leases [Member] \| Financial Asset, Past Due [Member]
Loans receivable	6,097	1,491
Finance Leases Portfolio Segment [Member] \| Investment Rated Commercial Leases [Member] \| Financial Asset, Not Past Due [Member]
Loans receivable	68,189	81,135
Finance Leases Portfolio Segment [Member] \| Other [Member]
Loans receivable	81,809	88,851
Finance Leases Portfolio Segment [Member] \| Other [Member] \| Financial Asset, 30 to 59 Days Past Due [Member]
Loans receivable	1,358	3,015
Finance Leases Portfolio Segment [Member] \| Other [Member] \| Financial Asset, 60 to 89 Days Past Due [Member]
Loans receivable	0	0
Finance Leases Portfolio Segment [Member] \| Other [Member] \| Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans receivable	0	76
Finance Leases Portfolio Segment [Member] \| Other [Member] \| Financial Asset, Past Due [Member]
Loans receivable	1,358	3,091
Finance Leases Portfolio Segment [Member] \| Other [Member] \| Financial Asset, Not Past Due [Member]
Loans receivable	80,451	85,760
Finance Leases Portfolio Segment [Member] \| Middle Market Leases [Member]
Loans receivable	47,058	40,582
Finance Leases Portfolio Segment [Member] \| Middle Market Leases [Member] \| Financial Asset, 30 to 59 Days Past Due [Member]
Loans receivable	437	0
Finance Leases Portfolio Segment [Member] \| Middle Market Leases [Member] \| Financial Asset, 60 to 89 Days Past Due [Member]
Loans receivable	0	0
Finance Leases Portfolio Segment [Member] \| Middle Market Leases [Member] \| Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans receivable	0	0
Finance Leases Portfolio Segment [Member] \| Middle Market Leases [Member] \| Financial Asset, Past Due [Member]
Loans receivable	437	0
Finance Leases Portfolio Segment [Member] \| Middle Market Leases [Member] \| Financial Asset, Not Past Due [Member]
Loans receivable	46,621	40,582
Finance Leases Portfolio Segment [Member] \| Small Ticket Leases [Member]
Loans receivable	17,580	11,596
Finance Leases Portfolio Segment [Member] \| Small Ticket Leases [Member] \| Financial Asset, 30 to 59 Days Past Due [Member]
Loans receivable	0	0
Finance Leases Portfolio Segment [Member] \| Small Ticket Leases [Member] \| Financial Asset, 60 to 89 Days Past Due [Member]
Loans receivable	0	0
Finance Leases Portfolio Segment [Member] \| Small Ticket Leases [Member] \| Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans receivable	66	0
Finance Leases Portfolio Segment [Member] \| Small Ticket Leases [Member] \| Financial Asset, Past Due [Member]
Loans receivable	66	0
Finance Leases Portfolio Segment [Member] \| Small Ticket Leases [Member] \| Financial Asset, Not Past Due [Member]
Loans receivable	17,514	11,596
Consumer Portfolio Segment [Member]
Loans receivable	1,572	1,685
Consumer Portfolio Segment [Member] \| Financial Asset, 30 to 59 Days Past Due [Member]
Loans receivable	7	13
Consumer Portfolio Segment [Member] \| Financial Asset, 60 to 89 Days Past Due [Member]
Loans receivable	6	4
Consumer Portfolio Segment [Member] \| Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans receivable	0	0
Consumer Portfolio Segment [Member] \| Financial Asset, Past Due [Member]
Loans receivable	13	17
Consumer Portfolio Segment [Member] \| Financial Asset, Not Past Due [Member]
Loans receivable	$ 1,559	$ 1,668

Note 4 - Loans Receivable - Aging of the Recorded Investment of Loans (Details) - USD ($)
$ in Thousands

Mar. 31, 2022

Dec. 31, 2021

Loans receivable

$ 1,061,377

$ 1,050,638

Financial Asset, 30 to 59 Days Past Due [Member]

Loans receivable

21,649

6,876

Financial Asset, 60 to 89 Days Past Due [Member]

Loans receivable