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Note 4 - Loans Receivable - Aging of the Recorded Investment of Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Past Due	$ 3,684	$ 5,103
Loans Not Past Due	1,069,852	1,169,625
Total Loans	1,073,536	1,174,728
Financial Asset, 30 to 59 Days Past Due [Member]
Past Due	1,129	3,431
Financial Asset, 60 to 89 Days Past Due [Member]
Past Due	223	830
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Past Due	2,332	842
Real Estate Portfolio [Member] | One-to-Four Family Residential Real Estate, Owner Occupied [Member]
Past Due	510	1,624
Loans Not Past Due	35,604	43,365
Total Loans	36,114	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	48	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	0	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	462	507
Real Estate Portfolio [Member] | One-to-Four Family Residential Real Estate, Non-owner Occupied [Member]
Past Due	98	295
Loans Not Past Due	8,600	10,466
Total Loans	8,698	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	95	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	0	0
Real Estate Portfolio [Member] | Multi-family Mortgage [Member] | ILLINOIS
Past Due	0	1,283
Loans Not Past Due	224,919	246,680
Total Loans	224,919	247,963
Real Estate Portfolio [Member] | Multi-family Mortgage [Member] | Other [Member]
Past Due	0	0
Loans Not Past Due	297,906	315,787
Total Loans	297,906	315,787
Real Estate Portfolio [Member] | Multi-family Mortgage [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | ILLINOIS
Past Due	0	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	1,870	288
Loans Not Past Due	122,607	134,386
Total Loans	124,477	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	1,870	288
Commercial Portfolio Segment [Member] | Commercial Lines and Loans for Operations [Member]
Past Due	0
Loans Not Past Due	90,767
Total Loans	90,767
Commercial Portfolio Segment [Member] | Commercial Lines and Loans for Operations [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Past Due	0
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] | Commercial Loans [Member]
Past Due		0
Loans Not Past Due		133,976
Total Loans		133,976
Commercial Portfolio Segment [Member] | Asset-based [Member]
Past Due	0	0
Loans Not Past Due	1,471	11,738
Total Loans	1,471	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	0	0
Loans Not Past Due	71,504	33,555
Total Loans	71,504	33,555
Finance Leases Portfolio Segment [Member] | Equipment Finance Leases, Government [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Past Due	0	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	563	873
Loans Not Past Due	81,449	101,015
Total Loans	82,012	101,888
Finance Leases Portfolio Segment [Member] | Investment Rated Commercial Leases [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Past Due	439	826
Finance Leases Portfolio Segment [Member] | Investment Rated Commercial Leases [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Past Due	124	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	633	679
Loans Not Past Due	133,251	136,507
Total Loans	133,884	137,186
Finance Leases Portfolio Segment [Member] | Other [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Past Due	633	543
Finance Leases Portfolio Segment [Member] | Other [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Past Due	0	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	10	61
Loans Not Past Due	1,774	2,150
Total Loans	1,784	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	4	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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