Note 4 - Loans Receivable - Aging of the Recorded Investment of Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Loans receivable	$ 1,050,638	$ 1,009,958
Financial Asset, 30 to 59 Days Past Due [Member]
Loans receivable	6,876	9,172
Financial Asset, 60 to 89 Days Past Due [Member]
Loans receivable	6,188	3,060
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans receivable	750	1,221
Financial Asset, Past Due [Member]
Loans receivable	13,814	13,453
Financial Asset, Not Past Due [Member]
Loans receivable	1,036,824	996,505
Construction and Land Loans [Member]
Loans receivable	0	499
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		499
Real Estate Portfolio [Member] \| One-to-Four Family Residential Real Estate, Owner Occupied [Member]
Loans receivable	24,131	33,375
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	181	252
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	250	211
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	367	834
Real Estate Portfolio [Member] \| One-to-Four Family Residential Real Estate, Owner Occupied [Member] \| Financial Asset, Past Due [Member]
Loans receivable	798	1,297
Real Estate Portfolio [Member] \| One-to-Four Family Residential Real Estate, Owner Occupied [Member] \| Financial Asset, Not Past Due [Member]
Loans receivable	23,333	32,078
Real Estate Portfolio [Member] \| One-to-Four Family Residential Real Estate, Non-owner Occupied [Member]
Loans receivable	6,002	8,316
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	3
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	9	132
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	91
Real Estate Portfolio [Member] \| One-to-Four Family Residential Real Estate, Non-owner Occupied [Member] \| Financial Asset, Past Due [Member]
Loans receivable	11	226
Real Estate Portfolio [Member] \| One-to-Four Family Residential Real Estate, Non-owner Occupied [Member] \| Financial Asset, Not Past Due [Member]
Loans receivable	5,991	8,090
Real Estate Portfolio [Member] \| Multi-family Mortgage [Member]
Loans receivable	426,136	452,241
Real Estate Portfolio [Member] \| Multi-family Mortgage [Member] \| ILLINOIS
Loans receivable	235,870	222,029
Real Estate Portfolio [Member] \| Multi-family Mortgage [Member] \| Other [Member]
Loans receivable	190,266	230,212
Real Estate Portfolio [Member] \| Multi-family Mortgage [Member] \| Financial Asset, 30 to 59 Days Past Due [Member] \| ILLINOIS
Loans receivable	189	86
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	189	86
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	235,681	221,943
Real Estate Portfolio [Member] \| Multi-family Mortgage [Member] \| Financial Asset, Not Past Due [Member] \| Other [Member]
Loans receivable	190,266	230,212
Real Estate Portfolio [Member] \| Nonresidential Real Estate [Member]
Loans receivable	103,172	108,658
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	297	296
Real Estate Portfolio [Member] \| Nonresidential Real Estate [Member] \| Financial Asset, Past Due [Member]
Loans receivable	297	296
Real Estate Portfolio [Member] \| Nonresidential Real Estate [Member] \| Financial Asset, Not Past Due [Member]
Loans receivable	102,875	108,362
Commercial Portfolio Segment [Member]
Loans receivable	489,512	405,057
Commercial Portfolio Segment [Member] \| Construction and Land Loans [Member]
Loans receivable		499
Commercial Portfolio Segment [Member] \| Commercial Lines and Loans for Operations [Member]
Loans receivable	67,995	77,695
Commercial Portfolio Segment [Member] \| Commercial Lines and Loans for Operations [Member] \| Financial Asset, 30 to 59 Days Past Due [Member]
Loans receivable	0	4,886
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	4,886
Commercial Portfolio Segment [Member] \| Commercial Lines and Loans for Operations [Member] \| Financial Asset, Not Past Due [Member]
Loans receivable	67,995	72,809
Commercial Portfolio Segment [Member] \| Asset-based [Member]
Loans receivable	19,400	1,740
Commercial Portfolio Segment [Member] \| Asset-based [Member] \| Financial Asset, 30 to 59 Days Past Due [Member]
Loans receivable	26	0
Commercial Portfolio Segment [Member] \| Asset-based [Member] \| Financial Asset, 60 to 89 Days Past Due [Member]
Loans receivable	6	0
Commercial Portfolio Segment [Member] \| Asset-based [Member] \| Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans receivable	10	0
Commercial Portfolio Segment [Member] \| Asset-based [Member] \| Financial Asset, Past Due [Member]
Loans receivable	42	0
Commercial Portfolio Segment [Member] \| Asset-based [Member] \| Financial Asset, Not Past Due [Member]
Loans receivable	19,358	1,740
Finance Leases Portfolio Segment [Member] \| Equipment Finance Leases, Government [Member]
Loans receivable	178,462	102,740
Finance Leases Portfolio Segment [Member] \| Equipment Finance Leases, Government [Member] \| Financial Asset, 30 to 59 Days Past Due [Member]
Loans receivable	3,160	2,468
Finance Leases Portfolio Segment [Member] \| Equipment Finance Leases, Government [Member] \| Financial Asset, 60 to 89 Days Past Due [Member]
Loans receivable	4,718	0
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	7,878	2,468
Finance Leases Portfolio Segment [Member] \| Equipment Finance Leases, Government [Member] \| Financial Asset, Not Past Due [Member]
Loans receivable	170,584	100,272
Finance Leases Portfolio Segment [Member] \| Investment Rated Commercial Leases [Member]
Loans receivable	82,626	88,594
Finance Leases Portfolio Segment [Member] \| Investment Rated Commercial Leases [Member] \| Financial Asset, 30 to 59 Days Past Due [Member]
Loans receivable	290	618
Finance Leases Portfolio Segment [Member] \| Investment Rated Commercial Leases [Member] \| Financial Asset, 60 to 89 Days Past Due [Member]
Loans receivable	1,201	225
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	1,491	843
Finance Leases Portfolio Segment [Member] \| Investment Rated Commercial Leases [Member] \| Financial Asset, Not Past Due [Member]
Loans receivable	81,135	87,751
Finance Leases Portfolio Segment [Member] \| Other [Member]
Loans receivable	88,851	126,017
Finance Leases Portfolio Segment [Member] \| Other [Member] \| Financial Asset, 30 to 59 Days Past Due [Member]
Loans receivable	3,015	853
Finance Leases Portfolio Segment [Member] \| Other [Member] \| Financial Asset, 60 to 89 Days Past Due [Member]
Loans receivable	0	2,487
Finance Leases Portfolio Segment [Member] \| Other [Member] \| Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans receivable	76	0
Finance Leases Portfolio Segment [Member] \| Other [Member] \| Financial Asset, Past Due [Member]
Loans receivable	3,091	3,340
Finance Leases Portfolio Segment [Member] \| Other [Member] \| Financial Asset, Not Past Due [Member]
Loans receivable	85,760	122,677
Finance Leases Portfolio Segment [Member] \| Middle Market Leases [Member]
Loans receivable	40,582	6,988
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	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	0	0
Finance Leases Portfolio Segment [Member] \| Middle Market Leases [Member] \| Financial Asset, Not Past Due [Member]
Loans receivable	40,582	6,988
Finance Leases Portfolio Segment [Member] \| Small Ticket Leases [Member]
Loans receivable	11,596	1,283
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	0	0
Finance Leases Portfolio Segment [Member] \| Small Ticket Leases [Member] \| Financial Asset, Past Due [Member]
Loans receivable	0	0
Finance Leases Portfolio Segment [Member] \| Small Ticket Leases [Member] \| Financial Asset, Not Past Due [Member]
Loans receivable	11,596	1,283
Consumer Portfolio Segment [Member]
Loans receivable	1,685	1,812
Consumer Portfolio Segment [Member] \| Financial Asset, 30 to 59 Days Past Due [Member]
Loans receivable	13	6
Consumer Portfolio Segment [Member] \| Financial Asset, 60 to 89 Days Past Due [Member]
Loans receivable	4	5
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	17	11
Consumer Portfolio Segment [Member] \| Financial Asset, Not Past Due [Member]
Loans receivable	$ 1,668	$ 1,801

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

Dec. 31, 2021

Dec. 31, 2020

Loans receivable

$ 1,050,638

$ 1,009,958

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

Loans receivable

6,876

9,172

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

Loans receivable