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Note 4 - Loans Receivable - Aging of the Recorded Investment of Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Past Due	$ 4,578	$ 5,103
Loans Not Past Due	1,084,918	1,169,625
Total Loans	1,089,496	1,174,728
Financial Asset, 30 to 59 Days Past Due [Member]
Past Due	1,945	3,431
Financial Asset, 60 to 89 Days Past Due [Member]
Past Due	854	830
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Past Due	1,779	842
Real Estate Portfolio [Member] | One-to-Four Family Residential Real Estate, Owner Occupied [Member]
Past Due	679	1,624
Loans Not Past Due	38,931	43,365
Total Loans	39,610	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	0	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	21	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	658	507
Real Estate Portfolio [Member] | One-to-Four Family Residential Real Estate, Non-owner Occupied [Member]
Past Due	190	295
Loans Not Past Due	9,128	10,466
Total Loans	9,318	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	187	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	230,913	246,680
Total Loans	230,913	247,963
Real Estate Portfolio [Member] | Multi-family Mortgage [Member] | Other [Member]
Past Due	0	0
Loans Not Past Due	305,706	315,787
Total Loans	305,706	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	288	288
Loans Not Past Due	127,272	134,386
Total Loans	127,560	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	288	288
Commercial Portfolio Segment [Member] | Regional Commercial Banking [Member]
Past Due	0	0
Loans Not Past Due	32,388	24,853
Total Loans	32,388	24,853
Commercial Portfolio Segment [Member] | Regional Commercial Banking [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Past Due	0	0
Commercial Portfolio Segment [Member] | Regional Commercial Banking [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Past Due	0	0
Commercial Portfolio Segment [Member] | Regional Commercial Banking [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Past Due	0	0
Commercial Portfolio Segment [Member] | Health Care Loans [Member]
Past Due	0	0
Loans Not Past Due	12,554	70,430
Total Loans	12,554	70,430
Commercial Portfolio Segment [Member] | Health Care Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Past Due	0	0
Commercial Portfolio Segment [Member] | Health Care Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Past Due	0	0
Commercial Portfolio Segment [Member] | Health Care Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Past Due	0	0
Commercial Portfolio Segment [Member] | Direct Commercial Lessor [Member]
Past Due	0	0
Loans Not Past Due	81,667	50,431
Total Loans	81,667	50,431
Commercial Portfolio Segment [Member] | Direct Commercial Lessor [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Past Due	0	0
Commercial Portfolio Segment [Member] | Direct Commercial Lessor [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Past Due	0	0
Commercial Portfolio Segment [Member] | Direct Commercial Lessor [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	509	873
Loans Not Past Due	114,123	132,966
Total Loans	114,632	133,839
Finance Leases Portfolio Segment [Member] | Investment Rated Commercial Leases [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Past Due	0	826
Finance Leases Portfolio Segment [Member] | Investment Rated Commercial Leases [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Past Due	509	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	2,905	679
Loans Not Past Due	130,460	138,111
Total Loans	133,365	138,790
Finance Leases Portfolio Segment [Member] | Other [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Past Due	1,936	543
Finance Leases Portfolio Segment [Member] | Other [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Past Due	136	136
Finance Leases Portfolio Segment [Member] | Other [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Past Due	833	0
Consumer Portfolio Segment [Member]
Past Due	7	61
Loans Not Past Due	1,776	2,150
Total Loans	1,783	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	1	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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