Note 4 - Loans Receivable - Risk Categories of Loans By Class of Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Loans receivable	$ 1,233,287	$ 1,050,638
Pass [Member]
Loans receivable	1,225,988	1,047,962
Special Mention [Member]
Loans receivable	1,525	1,454
Substandard [Member]
Loans receivable	4,371	482
Nonaccrual [Member]
Loans receivable	1,403	740
Construction and Land Loans [Member]
Loans receivable	160	0
Construction and Land Loans [Member] | Pass [Member]
Loans receivable	160
Construction and Land Loans [Member] | Special Mention [Member]
Loans receivable	0
Construction and Land Loans [Member] | Substandard [Member]
Loans receivable	0
Construction and Land Loans [Member] | Nonaccrual [Member]
Loans receivable	0
Real Estate Portfolio [Member] | One-to-Four Family Residential Real Estate, Owner Occupied [Member]
Loans receivable	18,341	24,131
Real Estate Portfolio [Member] | One-to-Four Family Residential Real Estate, Owner Occupied [Member] | Pass [Member]
Loans receivable	17,987	23,396
Real Estate Portfolio [Member] | One-to-Four Family Residential Real Estate, Owner Occupied [Member] | Special Mention [Member]
Loans receivable	4	0
Real Estate Portfolio [Member] | One-to-Four Family Residential Real Estate, Owner Occupied [Member] | Substandard [Member]
Loans receivable	258	368
Real Estate Portfolio [Member] | One-to-Four Family Residential Real Estate, Owner Occupied [Member] | Nonaccrual [Member]
Loans receivable	92	367
Real Estate Portfolio [Member] | One-to-Four Family Residential Real Estate, Non-owner Occupied [Member]
Loans receivable	4,753	6,002
Real Estate Portfolio [Member] | One-to-Four Family Residential Real Estate, Non-owner Occupied [Member] | Pass [Member]
Loans receivable	4,685	5,894
Real Estate Portfolio [Member] | One-to-Four Family Residential Real Estate, Non-owner Occupied [Member] | Special Mention [Member]
Loans receivable	0	0
Real Estate Portfolio [Member] | One-to-Four Family Residential Real Estate, Non-owner Occupied [Member] | Substandard [Member]
Loans receivable	68	108
Real Estate Portfolio [Member] | One-to-Four Family Residential Real Estate, Non-owner Occupied [Member] | Nonaccrual [Member]
Loans receivable	0	0
Real Estate Portfolio [Member] | Multi-family Mortgage [Member]
Loans receivable	536,295	426,136
Real Estate Portfolio [Member] | Multi-family Mortgage [Member] | ILLINOIS
Loans receivable	310,172	235,870
Real Estate Portfolio [Member] | Multi-family Mortgage [Member] | Other [Member]
Loans receivable	226,123	190,266
Real Estate Portfolio [Member] | Multi-family Mortgage [Member] | Pass [Member] | ILLINOIS
Loans receivable	310,172	235,545
Real Estate Portfolio [Member] | Multi-family Mortgage [Member] | Pass [Member] | Other [Member]
Loans receivable	226,123	190,266
Real Estate Portfolio [Member] | Multi-family Mortgage [Member] | Special Mention [Member] | ILLINOIS
Loans receivable	0	325
Real Estate Portfolio [Member] | Multi-family Mortgage [Member] | Special Mention [Member] | Other [Member]
Loans receivable	0	0
Real Estate Portfolio [Member] | Multi-family Mortgage [Member] | Substandard [Member] | ILLINOIS
Loans receivable	0	0
Real Estate Portfolio [Member] | Multi-family Mortgage [Member] | Substandard [Member] | Other [Member]
Loans receivable	0	0
Real Estate Portfolio [Member] | Multi-family Mortgage [Member] | Nonaccrual [Member] | ILLINOIS
Loans receivable	0	0
Real Estate Portfolio [Member] | Multi-family Mortgage [Member] | Nonaccrual [Member] | Other [Member]
Loans receivable	0	0
Real Estate Portfolio [Member] | Nonresidential Real Estate [Member]
Loans receivable	119,660	103,172
Real Estate Portfolio [Member] | Nonresidential Real Estate [Member] | Pass [Member]
Loans receivable	119,660	102,875
Real Estate Portfolio [Member] | Nonresidential Real Estate [Member] | Special Mention [Member]
Loans receivable	0	0
Real Estate Portfolio [Member] | Nonresidential Real Estate [Member] | Substandard [Member]
Loans receivable	0	0
Real Estate Portfolio [Member] | Nonresidential Real Estate [Member] | Nonaccrual [Member]
Loans receivable	0	297
Commercial Portfolio Segment [Member]
Loans receivable	552,494	489,512
Commercial Portfolio Segment [Member] | Commercial Lines and Loans for Operations [Member]
Loans receivable	76,716	67,995
Commercial Portfolio Segment [Member] | Commercial Lines and Loans for Operations [Member] | Pass [Member]
Loans receivable	76,716	67,995
Commercial Portfolio Segment [Member] | Commercial Lines and Loans for Operations [Member] | Special Mention [Member]
Loans receivable	0	0
Commercial Portfolio Segment [Member] | Commercial Lines and Loans for Operations [Member] | Substandard [Member]
Loans receivable	0	0
Commercial Portfolio Segment [Member] | Commercial Lines and Loans for Operations [Member] | Nonaccrual [Member]
Loans receivable	0	0
Commercial Portfolio Segment [Member] | Asset-based and Factored Receivables [Member]
Loans receivable	20,035	19,400
Commercial Portfolio Segment [Member] | Asset-based and Factored Receivables [Member] | Pass [Member]
Loans receivable	15,346	19,400
Commercial Portfolio Segment [Member] | Asset-based and Factored Receivables [Member] | Special Mention [Member]
Loans receivable	873	0
Commercial Portfolio Segment [Member] | Asset-based and Factored Receivables [Member] | Substandard [Member]
Loans receivable	3,816	0
Commercial Portfolio Segment [Member] | Asset-based and Factored Receivables [Member] | Nonaccrual [Member]
Loans receivable	0	0
Finance Leases Portfolio Segment [Member] | Equipment Finance Leases, Government [Member]
Loans receivable	211,506	178,462
Finance Leases Portfolio Segment [Member] | Equipment Finance Leases, Government [Member] | Pass [Member]
Loans receivable	211,454	178,427
Finance Leases Portfolio Segment [Member] | Equipment Finance Leases, Government [Member] | Special Mention [Member]
Loans receivable	0	35
Finance Leases Portfolio Segment [Member] | Equipment Finance Leases, Government [Member] | Substandard [Member]
Loans receivable	52	0
Finance Leases Portfolio Segment [Member] | Equipment Finance Leases, Government [Member] | Nonaccrual [Member]
Loans receivable	0	0
Finance Leases Portfolio Segment [Member] | Investment Rated Commercial Leases [Member]
Loans receivable	57,885	82,626
Finance Leases Portfolio Segment [Member] | Investment Rated Commercial Leases [Member] | Pass [Member]
Loans receivable	57,755	82,626
Finance Leases Portfolio Segment [Member] | Investment Rated Commercial Leases [Member] | Special Mention [Member]
Loans receivable	0	0
Finance Leases Portfolio Segment [Member] | Investment Rated Commercial Leases [Member] | Substandard [Member]
Loans receivable	130	0
Finance Leases Portfolio Segment [Member] | Investment Rated Commercial Leases [Member] | Nonaccrual [Member]
Loans receivable	0	0
Finance Leases Portfolio Segment [Member] | Other [Member]
Loans receivable	95,606	88,851
Finance Leases Portfolio Segment [Member] | Other [Member] | Pass [Member]
Loans receivable	94,588	87,685
Finance Leases Portfolio Segment [Member] | Other [Member] | Special Mention [Member]
Loans receivable	644	1,090
Finance Leases Portfolio Segment [Member] | Other [Member] | Substandard [Member]
Loans receivable	43	0
Finance Leases Portfolio Segment [Member] | Other [Member] | Nonaccrual [Member]
Loans receivable	331	76
Finance Leases Portfolio Segment [Member] | Middle Market Leases [Member]
Loans receivable	55,910	40,582
Finance Leases Portfolio Segment [Member] | Middle Market Leases [Member] | Pass [Member]
Loans receivable	55,023	40,582
Finance Leases Portfolio Segment [Member] | Middle Market Leases [Member] | Special Mention [Member]
Loans receivable	0	0
Finance Leases Portfolio Segment [Member] | Middle Market Leases [Member] | Substandard [Member]
Loans receivable	0	0
Finance Leases Portfolio Segment [Member] | Middle Market Leases [Member] | Nonaccrual [Member]
Loans receivable	887	0
Finance Leases Portfolio Segment [Member] | Small Ticket Leases [Member]
Loans receivable	34,836	11,596
Finance Leases Portfolio Segment [Member] | Small Ticket Leases [Member] | Pass [Member]
Loans receivable	34,748	11,596
Finance Leases Portfolio Segment [Member] | Small Ticket Leases [Member] | Special Mention [Member]
Loans receivable	0	0
Finance Leases Portfolio Segment [Member] | Small Ticket Leases [Member] | Substandard [Member]
Loans receivable	0	0
Finance Leases Portfolio Segment [Member] | Small Ticket Leases [Member] | Nonaccrual [Member]
Loans receivable	88	0
Consumer Portfolio Segment [Member]
Loans receivable	1,584	1,685
Consumer Portfolio Segment [Member] | Pass [Member]
Loans receivable	1,571	1,675
Consumer Portfolio Segment [Member] | Special Mention [Member]
Loans receivable	4	4
Consumer Portfolio Segment [Member] | Substandard [Member]
Loans receivable	4	6
Consumer Portfolio Segment [Member] | Nonaccrual [Member]
Loans receivable	$ 5	$ 0