Note 4 - Loans Receivable - Risk Categories of Loans By Class of Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Loans receivable	$ 1,061,377	$ 1,050,638
Pass [Member]
Loans receivable	1,054,913	1,047,962
Special Mention [Member]
Loans receivable	5,534	1,454
Substandard [Member]
Loans receivable	499	482
Nonaccrual [Member]
Loans receivable	431	740
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] | Pass [Member]
Loans receivable	22,028	23,396
Real Estate Portfolio [Member] | One-to-Four Family Residential Real Estate, Owner Occupied [Member] | Special Mention [Member]
Loans receivable	0	0
Real Estate Portfolio [Member] | One-to-Four Family Residential Real Estate, Owner Occupied [Member] | Substandard [Member]
Loans receivable	357	368
Real Estate Portfolio [Member] | One-to-Four Family Residential Real Estate, Owner Occupied [Member] | Nonaccrual [Member]
Loans receivable	330	367
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] | Pass [Member]
Loans receivable	5,430	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	76	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	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] | Pass [Member] | ILLINOIS
Loans receivable	250,999	235,545
Real Estate Portfolio [Member] | Multi-family Mortgage [Member] | Pass [Member] | Other [Member]
Loans receivable	184,200	190,266
Real Estate Portfolio [Member] | Multi-family Mortgage [Member] | Special Mention [Member] | ILLINOIS
Loans receivable	323	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	99,817	103,172
Real Estate Portfolio [Member] | Nonresidential Real Estate [Member] | Pass [Member]
Loans receivable	99,817	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	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] | Pass [Member]
Loans receivable	70,925	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	30,888	19,400
Commercial Portfolio Segment [Member] | Asset-based and Factored Receivables [Member] | Pass [Member]
Loans receivable	26,672	19,400
Commercial Portfolio Segment [Member] | Asset-based and Factored Receivables [Member] | Special Mention [Member]
Loans receivable	4,216	0
Commercial Portfolio Segment [Member] | Asset-based and Factored Receivables [Member] | Substandard [Member]
Loans receivable	0	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	173,699	178,462
Finance Leases Portfolio Segment [Member] | Equipment Finance Leases, Government [Member] | Pass [Member]
Loans receivable	173,664	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	0	0
Finance Leases Portfolio Segment [Member] | Equipment Finance Leases, Government [Member] | Nonaccrual [Member]
Loans receivable	35	0
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] | Pass [Member]
Loans receivable	74,286	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	0	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	81,809	88,851
Finance Leases Portfolio Segment [Member] | Other [Member] | Pass [Member]
Loans receivable	80,757	87,685
Finance Leases Portfolio Segment [Member] | Other [Member] | Special Mention [Member]
Loans receivable	989	1,090
Finance Leases Portfolio Segment [Member] | Other [Member] | Substandard [Member]
Loans receivable	63	0
Finance Leases Portfolio Segment [Member] | Other [Member] | Nonaccrual [Member]
Loans receivable	0	76
Finance Leases Portfolio Segment [Member] | Middle Market Leases [Member]
Loans receivable	47,058	40,582
Finance Leases Portfolio Segment [Member] | Middle Market Leases [Member] | Pass [Member]
Loans receivable	47,058	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	0	0
Finance Leases Portfolio Segment [Member] | Small Ticket Leases [Member]
Loans receivable	17,580	11,596
Finance Leases Portfolio Segment [Member] | Small Ticket Leases [Member] | Pass [Member]
Loans receivable	17,514	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	66	0
Consumer Portfolio Segment [Member]
Loans receivable	1,572	1,685
Consumer Portfolio Segment [Member] | Pass [Member]
Loans receivable	1,563	1,675
Consumer Portfolio Segment [Member] | Special Mention [Member]
Loans receivable	6	4
Consumer Portfolio Segment [Member] | Substandard [Member]
Loans receivable	3	6
Consumer Portfolio Segment [Member] | Nonaccrual [Member]
Loans receivable	$ 0	$ 0