Note 4 - Loans Receivable - Aging of the Recorded Investment of Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Loans receivable	$ 1,039,161	$ 1,009,958
Financial Asset, 30 to 59 Days Past Due [Member]
Loans receivable	291	9,172
Financial Asset, 60 to 89 Days Past Due [Member]
Loans receivable	1,637	3,060
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans receivable	884	1,221
Financial Asset, Past Due [Member]
Loans receivable	2,812	13,453
Financial Asset, Not Past Due [Member]
Loans receivable	1,036,349	996,505
Construction and Land Loans [Member]
Loans receivable	499	499
Construction and Land Loans [Member] \| Financial Asset, 30 to 59 Days Past Due [Member]
Loans receivable	0	0
Construction and Land Loans [Member] \| Financial Asset, 60 to 89 Days Past Due [Member]
Loans receivable	0	0
Construction and Land Loans [Member] \| Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans receivable	0	0
Construction and Land Loans [Member] \| Financial Asset, Past Due [Member]
Loans receivable	0	0
Construction and Land Loans [Member] \| Financial Asset, Not Past Due [Member]
Loans receivable	499	499
Real Estate Portfolio [Member] \| One-to-Four Family Residential Real Estate, Owner Occupied [Member]
Loans receivable	27,648	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	0	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	0	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	588	834
Real Estate Portfolio [Member] \| One-to-Four Family Residential Real Estate, Owner Occupied [Member] \| Financial Asset, Past Due [Member]
Loans receivable	588	1,297
Real Estate Portfolio [Member] \| One-to-Four Family Residential Real Estate, Owner Occupied [Member] \| Financial Asset, Not Past Due [Member]
Loans receivable	27,060	32,078
Real Estate Portfolio [Member] \| One-to-Four Family Residential Real Estate, Non-owner Occupied [Member]
Loans receivable	7,114	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	14	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	0	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	14	226
Real Estate Portfolio [Member] \| One-to-Four Family Residential Real Estate, Non-owner Occupied [Member] \| Financial Asset, Not Past Due [Member]
Loans receivable	7,100	8,090
Real Estate Portfolio [Member] \| Multi-family Mortgage [Member]
Loans receivable	434,635	452,241
Real Estate Portfolio [Member] \| Multi-family Mortgage [Member] \| ILLINOIS
Loans receivable	223,738	222,029
Real Estate Portfolio [Member] \| Multi-family Mortgage [Member] \| Other [Member]
Loans receivable	210,897	230,212
Real Estate Portfolio [Member] \| Multi-family Mortgage [Member] \| Financial Asset, 30 to 59 Days Past Due [Member] \| ILLINOIS
Loans receivable	0	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	0	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	223,738	221,943
Real Estate Portfolio [Member] \| Multi-family Mortgage [Member] \| Financial Asset, Not Past Due [Member] \| Other [Member]
Loans receivable	210,897	230,212
Real Estate Portfolio [Member] \| Nonresidential Real Estate [Member]
Loans receivable	100,008	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	296	296
Real Estate Portfolio [Member] \| Nonresidential Real Estate [Member] \| Financial Asset, Past Due [Member]
Loans receivable	296	296
Real Estate Portfolio [Member] \| Nonresidential Real Estate [Member] \| Financial Asset, Not Past Due [Member]
Loans receivable	99,712	108,362
Commercial Portfolio Segment [Member]
Loans receivable	467,461	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	79,193	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	79,193	72,809
Commercial Portfolio Segment [Member] \| Asset-based [Member]
Loans receivable	1,759	1,740
Commercial Portfolio Segment [Member] \| Asset-based [Member] \| Financial Asset, 30 to 59 Days Past Due [Member]
Loans receivable	0	0
Commercial Portfolio Segment [Member] \| Asset-based [Member] \| Financial Asset, 60 to 89 Days Past Due [Member]
Loans receivable	0	0
Commercial Portfolio Segment [Member] \| Asset-based [Member] \| Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans receivable	0	0
Commercial Portfolio Segment [Member] \| Asset-based [Member] \| Financial Asset, Past Due [Member]
Loans receivable	0	0
Commercial Portfolio Segment [Member] \| Asset-based [Member] \| Financial Asset, Not Past Due [Member]
Loans receivable	1,759	1,740
Finance Leases Portfolio Segment [Member] \| Equipment Finance Leases, Government [Member]
Loans receivable	158,772	102,740
Finance Leases Portfolio Segment [Member] \| Equipment Finance Leases, Government [Member] \| Financial Asset, 30 to 59 Days Past Due [Member]
Loans receivable	0	2,468
Finance Leases Portfolio Segment [Member] \| Equipment Finance Leases, Government [Member] \| Financial Asset, 60 to 89 Days Past Due [Member]
Loans receivable	0	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	0	2,468
Finance Leases Portfolio Segment [Member] \| Equipment Finance Leases, Government [Member] \| Financial Asset, Not Past Due [Member]
Loans receivable	158,772	100,272
Finance Leases Portfolio Segment [Member] \| Investment Rated Commercial Leases [Member]
Loans receivable	81,468	87,260
Finance Leases Portfolio Segment [Member] \| Investment Rated Commercial Leases [Member] \| Financial Asset, 30 to 59 Days Past Due [Member]
Loans receivable	9	618
Finance Leases Portfolio Segment [Member] \| Investment Rated Commercial Leases [Member] \| Financial Asset, 60 to 89 Days Past Due [Member]
Loans receivable	0	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	9	843
Finance Leases Portfolio Segment [Member] \| Investment Rated Commercial Leases [Member] \| Financial Asset, Not Past Due [Member]
Loans receivable	81,459	86,417
Finance Leases Portfolio Segment [Member] \| Other [Member]
Loans receivable	146,269	135,622
Finance Leases Portfolio Segment [Member] \| Other [Member] \| Financial Asset, 30 to 59 Days Past Due [Member]
Loans receivable	267	853
Finance Leases Portfolio Segment [Member] \| Other [Member] \| Financial Asset, 60 to 89 Days Past Due [Member]
Loans receivable	1,635	2,487
Finance Leases Portfolio Segment [Member] \| Other [Member] \| Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans receivable	0	0
Finance Leases Portfolio Segment [Member] \| Other [Member] \| Financial Asset, Past Due [Member]
Loans receivable	1,902	3,340
Finance Leases Portfolio Segment [Member] \| Other [Member] \| Financial Asset, Not Past Due [Member]
Loans receivable	144,367	132,282
Consumer Portfolio Segment [Member]
Loans receivable	1,796	1,812
Consumer Portfolio Segment [Member] \| Financial Asset, 30 to 59 Days Past Due [Member]
Loans receivable	1	6
Consumer Portfolio Segment [Member] \| Financial Asset, 60 to 89 Days Past Due [Member]
Loans receivable	2	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	3	11
Consumer Portfolio Segment [Member] \| Financial Asset, Not Past Due [Member]
Loans receivable	$ 1,793	$ 1,801

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

Jun. 30, 2021

Dec. 31, 2020

Loans receivable

$ 1,039,161

$ 1,009,958

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

Loans receivable

291

9,172

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

Loans receivable