Note 4 - Loans Receivable - Aging of the Recorded Investment of Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Loans receivable	$ 1,149,292	$ 1,050,638
Financial Asset, 30 to 59 Days Past Due [Member]
Loans receivable	486	6,876
Financial Asset, 60 to 89 Days Past Due [Member]
Loans receivable	18,850	6,188
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans receivable	1,664	750
Financial Asset, Past Due [Member]
Loans receivable	21,000	13,814
Financial Asset, Not Past Due [Member]
Loans receivable	1,128,292	1,036,824
Construction and Land Loans [Member]
Loans receivable	84	0
Construction and Land Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans receivable	0
Construction and Land Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans receivable	0
Construction and Land Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans receivable	0
Construction and Land Loans [Member] | Financial Asset, Past Due [Member]
Loans receivable	0
Construction and Land Loans [Member] | Financial Asset, Not Past Due [Member]
Loans receivable	84
Real Estate Portfolio [Member] | One-to-Four Family Residential Real Estate, Owner Occupied [Member]
Loans receivable	21,550	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	0	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	224	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	301	367
Real Estate Portfolio [Member] | One-to-Four Family Residential Real Estate, Owner Occupied [Member] | Financial Asset, Past Due [Member]
Loans receivable	525	798
Real Estate Portfolio [Member] | One-to-Four Family Residential Real Estate, Owner Occupied [Member] | Financial Asset, Not Past Due [Member]
Loans receivable	21,025	23,333
Real Estate Portfolio [Member] | One-to-Four Family Residential Real Estate, Non-owner Occupied [Member]
Loans receivable	4,697	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	2	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	81	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	83	11
Real Estate Portfolio [Member] | One-to-Four Family Residential Real Estate, Non-owner Occupied [Member] | Financial Asset, Not Past Due [Member]
Loans receivable	4,614	5,991
Real Estate Portfolio [Member] | Multi-family Mortgage [Member]
Loans receivable	485,742	426,136
Real Estate Portfolio [Member] | Multi-family Mortgage [Member] | ILLINOIS
Loans receivable	277,845	235,870
Real Estate Portfolio [Member] | Multi-family Mortgage [Member] | Other [Member]
Loans receivable	207,897	190,266
Real Estate Portfolio [Member] | Multi-family Mortgage [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | ILLINOIS
Loans receivable	0	189
Real Estate Portfolio [Member] | Multi-family Mortgage [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Other [Member]
Loans receivable	0	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	0	189
Real Estate Portfolio [Member] | Multi-family Mortgage [Member] | Financial Asset, Past Due [Member] | Other [Member]
Loans receivable	0	0
Real Estate Portfolio [Member] | Multi-family Mortgage [Member] | Financial Asset, Not Past Due [Member] | ILLINOIS
Loans receivable	277,845	235,681
Real Estate Portfolio [Member] | Multi-family Mortgage [Member] | Financial Asset, Not Past Due [Member] | Other [Member]
Loans receivable	207,897	190,266
Real Estate Portfolio [Member] | Nonresidential Real Estate [Member]
Loans receivable	115,983	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	115,983	102,875
Commercial Portfolio Segment [Member]
Loans receivable	519,662	489,512
Commercial Portfolio Segment [Member] | Commercial Lines and Loans for Operations [Member]
Loans receivable	53,772	67,995
Commercial Portfolio Segment [Member] | Commercial Lines and Loans for Operations [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans receivable	0	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	0	0
Commercial Portfolio Segment [Member] | Commercial Lines and Loans for Operations [Member] | Financial Asset, Not Past Due [Member]
Loans receivable	53,772	67,995
Commercial Portfolio Segment [Member] | Asset-based and Factored Receivables [Member]
Loans receivable	32,860	19,400
Commercial Portfolio Segment [Member] | Asset-based and Factored Receivables [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans receivable	254	26
Commercial Portfolio Segment [Member] | Asset-based and Factored Receivables [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans receivable	60	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	314	42
Commercial Portfolio Segment [Member] | Asset-based and Factored Receivables [Member] | Financial Asset, Not Past Due [Member]
Loans receivable	32,546	19,358
Finance Leases Portfolio Segment [Member] | Equipment Finance Leases, Government [Member]
Loans receivable	208,887	178,462
Finance Leases Portfolio Segment [Member] | Equipment Finance Leases, Government [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans receivable	0	3,160
Finance Leases Portfolio Segment [Member] | Equipment Finance Leases, Government [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans receivable	17,090	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	0	0
Finance Leases Portfolio Segment [Member] | Equipment Finance Leases, Government [Member] | Financial Asset, Past Due [Member]
Loans receivable	17,090	7,878
Finance Leases Portfolio Segment [Member] | Equipment Finance Leases, Government [Member] | Financial Asset, Not Past Due [Member]
Loans receivable	191,797	170,584
Finance Leases Portfolio Segment [Member] | Investment Rated Commercial Leases [Member]
Loans receivable	64,797	82,626
Finance Leases Portfolio Segment [Member] | Investment Rated Commercial Leases [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans receivable	0	290
Finance Leases Portfolio Segment [Member] | Investment Rated Commercial Leases [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans receivable	566	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	213	0
Finance Leases Portfolio Segment [Member] | Investment Rated Commercial Leases [Member] | Financial Asset, Past Due [Member]
Loans receivable	779	1,491
Finance Leases Portfolio Segment [Member] | Investment Rated Commercial Leases [Member] | Financial Asset, Not Past Due [Member]
Loans receivable	64,018	81,135
Finance Leases Portfolio Segment [Member] | Other [Member]
Loans receivable	75,662	88,851
Finance Leases Portfolio Segment [Member] | Other [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans receivable	225	3,015
Finance Leases Portfolio Segment [Member] | Other [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans receivable	280	0
Finance Leases Portfolio Segment [Member] | Other [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans receivable	331	76
Finance Leases Portfolio Segment [Member] | Other [Member] | Financial Asset, Past Due [Member]
Loans receivable	836	3,091
Finance Leases Portfolio Segment [Member] | Other [Member] | Financial Asset, Not Past Due [Member]
Loans receivable	74,826	85,760
Finance Leases Portfolio Segment [Member] | Middle Market Leases [Member]
Loans receivable	59,457	40,582
Finance Leases Portfolio Segment [Member] | Middle Market Leases [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans receivable	0	0
Finance Leases Portfolio Segment [Member] | Middle Market Leases [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans receivable	538	0
Finance Leases Portfolio Segment [Member] | Middle Market Leases [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans receivable	753	0
Finance Leases Portfolio Segment [Member] | Middle Market Leases [Member] | Financial Asset, Past Due [Member]
Loans receivable	1,291	0
Finance Leases Portfolio Segment [Member] | Middle Market Leases [Member] | Financial Asset, Not Past Due [Member]
Loans receivable	58,166	40,582
Finance Leases Portfolio Segment [Member] | Small Ticket Leases [Member]
Loans receivable	24,227	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	24,161	11,596
Consumer Portfolio Segment [Member]
Loans receivable	1,574	1,685
Consumer Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans receivable	5	13
Consumer Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans receivable	11	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	16	17
Consumer Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Loans receivable	$ 1,558	$ 1,668