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Note 4 - Loans Receivable - Aging of the Recorded Investment of Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Past Due	$ 13,453	$ 5,103
Loans Not Past Due	996,505	1,169,625
Total Loans	1,009,958	1,174,728
Financial Asset, 30 to 59 Days Past Due [Member]
Past Due	9,172	3,431
Financial Asset, 60 to 89 Days Past Due [Member]
Past Due	3,060	830
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Past Due	1,221	842
Construction and Land Loans [Member]
Past Due	0
Loans Not Past Due	499
Total Loans	499
Construction and Land Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Past Due	0
Construction and Land Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Past Due	0
Construction and Land Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Past Due	0
Real Estate Portfolio [Member] | One-to-Four Family Residential Real Estate, Owner Occupied [Member]
Past Due	1,297	1,624
Loans Not Past Due	32,078	43,365
Total Loans	33,375	44,989
Real Estate Portfolio [Member] | One-to-Four Family Residential Real Estate, Owner Occupied [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Past Due	252	777
Real Estate Portfolio [Member] | One-to-Four Family Residential Real Estate, Owner Occupied [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Past Due	211	340
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]
Past Due	834	507
Real Estate Portfolio [Member] | One-to-Four Family Residential Real Estate, Non-owner Occupied [Member]
Past Due	226	295
Loans Not Past Due	8,090	10,466
Total Loans	8,316	10,761
Real Estate Portfolio [Member] | One-to-Four Family Residential Real Estate, Non-owner Occupied [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Past Due	3	280
Real Estate Portfolio [Member] | One-to-Four Family Residential Real Estate, Non-owner Occupied [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Past Due	132	15
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]
Past Due	91	0
Real Estate Portfolio [Member] | Multi-family Mortgage [Member] | ILLINOIS
Past Due	86	1,283
Loans Not Past Due	221,943	246,680
Total Loans	222,029	247,963
Real Estate Portfolio [Member] | Multi-family Mortgage [Member] | Other [Member]
Past Due	0	0
Loans Not Past Due	230,212	315,787
Total Loans	230,212	315,787
Real Estate Portfolio [Member] | Multi-family Mortgage [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | ILLINOIS
Past Due	86	981
Real Estate Portfolio [Member] | Multi-family Mortgage [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Other [Member]
Past Due	0	0
Real Estate Portfolio [Member] | Multi-family Mortgage [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | ILLINOIS
Past Due	0	302
Real Estate Portfolio [Member] | Multi-family Mortgage [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Other [Member]
Past Due	0	0
Real Estate Portfolio [Member] | Multi-family Mortgage [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | ILLINOIS
Past Due	0	0
Real Estate Portfolio [Member] | Multi-family Mortgage [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Other [Member]
Past Due	0	0
Real Estate Portfolio [Member] | Nonresidential Real Estate [Member]
Past Due	296	288
Loans Not Past Due	108,362	134,386
Total Loans	108,658	134,674
Real Estate Portfolio [Member] | Nonresidential Real Estate [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Past Due	0	0
Real Estate Portfolio [Member] | Nonresidential Real Estate [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Past Due	0	0
Real Estate Portfolio [Member] | Nonresidential Real Estate [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Past Due	296	288
Commercial Portfolio Segment [Member] | Commercial Loans [Member]
Past Due		0
Loans Not Past Due		133,976
Total Loans		133,976
Commercial Portfolio Segment [Member] | Commercial Lines and Loans for Operations [Member]
Past Due	4,886
Loans Not Past Due	72,809
Total Loans	77,695
Commercial Portfolio Segment [Member] | Commercial Lines and Loans for Operations [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Past Due	4,886
Commercial Portfolio Segment [Member] | Commercial Lines and Loans for Operations [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Past Due	0
Commercial Portfolio Segment [Member] | Commercial Lines and Loans for Operations [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Past Due	0
Commercial Portfolio Segment [Member] | Asset-based [Member]
Past Due	0	0
Loans Not Past Due	1,740	11,738
Total Loans	1,740	11,738
Commercial Portfolio Segment [Member] | Asset-based [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Past Due	0	0
Commercial Portfolio Segment [Member] | Asset-based [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Past Due	0	0
Commercial Portfolio Segment [Member] | Asset-based [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Past Due	0	0
Finance Leases Portfolio Segment [Member] | Equipment Finance Leases, Government [Member]
Past Due	2,468	0
Loans Not Past Due	100,272	33,555
Total Loans	102,740	33,555
Finance Leases Portfolio Segment [Member] | Equipment Finance Leases, Government [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Past Due	2,468	0
Finance Leases Portfolio Segment [Member] | Equipment Finance Leases, Government [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Past Due	0	0
Finance Leases Portfolio Segment [Member] | Equipment Finance Leases, Government [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Past Due	0	0
Finance Leases Portfolio Segment [Member] | Investment Rated Commercial Leases [Member]
Past Due	843	873
Loans Not Past Due	86,417	101,015
Total Loans	87,260	101,888
Finance Leases Portfolio Segment [Member] | Investment Rated Commercial Leases [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Past Due	618	826
Finance Leases Portfolio Segment [Member] | Investment Rated Commercial Leases [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Past Due	225	0
Finance Leases Portfolio Segment [Member] | Investment Rated Commercial Leases [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Past Due	0	47
Finance Leases Portfolio Segment [Member] | Other [Member]
Past Due	3,340	679
Loans Not Past Due	132,282	136,507
Total Loans	135,622	137,186
Finance Leases Portfolio Segment [Member] | Other [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Past Due	853	543
Finance Leases Portfolio Segment [Member] | Other [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Past Due	2,487	136
Finance Leases Portfolio Segment [Member] | Other [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Past Due	0	0
Consumer Portfolio Segment [Member]
Past Due	11	61
Loans Not Past Due	1,801	2,150
Total Loans	1,812	2,211
Consumer Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Past Due	6	24
Consumer Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Past Due	5	37
Consumer Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Past Due	$ 0	$ 0

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