Note 5 - Loans - Loans Designated as Criticized or Classified (Details) - USD ($)	Jun. 30, 2019	Dec. 31, 2018
Loans designated as criticized or classified	$ 41,844,000	$ 53,030,000
Special Mention [Member]
Loans designated as criticized or classified	10,211,000	6,576,000
Substandard [Member]
Loans designated as criticized or classified	30,754,000	42,942,000
Doubtful [Member]
Loans designated as criticized or classified	879,000	3,512,000
Loss [Member]
Loans designated as criticized or classified	0	0
Multi-family Residential Portfolio Segment [Member]
Loans designated as criticized or classified	3,515,000	6,664,000
Multi-family Residential Portfolio Segment [Member] | Special Mention [Member]
Loans designated as criticized or classified	1,290,000	2,498,000
Multi-family Residential Portfolio Segment [Member] | Substandard [Member]
Loans designated as criticized or classified	2,225,000	4,166,000
Multi-family Residential Portfolio Segment [Member] | Doubtful [Member]
Loans designated as criticized or classified	0	0
Multi-family Residential Portfolio Segment [Member] | Loss [Member]
Loans designated as criticized or classified	0	0
Commercial Real Estate Portfolio Segment [Member]
Loans designated as criticized or classified	1,926,000	4,432,000
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member]
Loans designated as criticized or classified	371,000	381,000
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member]
Loans designated as criticized or classified	1,555,000	4,051,000
Commercial Real Estate Portfolio Segment [Member] | Doubtful [Member]
Loans designated as criticized or classified	0	0
Commercial Real Estate Portfolio Segment [Member] | Loss [Member]
Loans designated as criticized or classified	0	0
One-To-Four Family - Mixed-Use Property Portfolio Segment [Member]
Loans designated as criticized or classified	3,034,000	3,233,000
One-To-Four Family - Mixed-Use Property Portfolio Segment [Member] | Special Mention [Member]
Loans designated as criticized or classified	912,000	1,199,000
One-To-Four Family - Mixed-Use Property Portfolio Segment [Member] | Substandard [Member]
Loans designated as criticized or classified	2,122,000	2,034,000
One-To-Four Family - Mixed-Use Property Portfolio Segment [Member] | Doubtful [Member]
Loans designated as criticized or classified	0	0
One-To-Four Family - Mixed-Use Property Portfolio Segment [Member] | Loss [Member]
Loans designated as criticized or classified	0	0
One-To-Four Family - Residential Portfolio Segment [Member]
Loans designated as criticized or classified	6,647,000	7,222,000
One-To-Four Family - Residential Portfolio Segment [Member] | Special Mention [Member]
Loans designated as criticized or classified	726,000	557,000
One-To-Four Family - Residential Portfolio Segment [Member] | Substandard [Member]
Loans designated as criticized or classified	5,921,000	6,665,000
One-To-Four Family - Residential Portfolio Segment [Member] | Doubtful [Member]
Loans designated as criticized or classified	0	0
One-To-Four Family - Residential Portfolio Segment [Member] | Loss [Member]
Loans designated as criticized or classified	0	0
Construction Portfolio Segment [Member]
Loans designated as criticized or classified	0	730,000
Construction Portfolio Segment [Member] | Special Mention [Member]
Loans designated as criticized or classified	0	730,000
Construction Portfolio Segment [Member] | Substandard [Member]
Loans designated as criticized or classified	0	0
Construction Portfolio Segment [Member] | Doubtful [Member]
Loans designated as criticized or classified	0	0
Construction Portfolio Segment [Member] | Loss [Member]
Loans designated as criticized or classified	0	0
Small Business Administration Portfolio Segment [Member]
Loans designated as criticized or classified	170,000	620,000
Small Business Administration Portfolio Segment [Member] | Special Mention [Member]
Loans designated as criticized or classified	56,000	481,000
Small Business Administration Portfolio Segment [Member] | Substandard [Member]
Loans designated as criticized or classified	114,000	139,000
Small Business Administration Portfolio Segment [Member] | Doubtful [Member]
Loans designated as criticized or classified	0	0
Small Business Administration Portfolio Segment [Member] | Loss [Member]
Loans designated as criticized or classified	0	0
Taxi Medallion Portfolio Segment [Member]
Loans designated as criticized or classified	3,555,000	4,539,000
Taxi Medallion Portfolio Segment [Member] | Special Mention [Member]
Loans designated as criticized or classified	0	0
Taxi Medallion Portfolio Segment [Member] | Substandard [Member]
Loans designated as criticized or classified	3,555,000	4,539,000
Taxi Medallion Portfolio Segment [Member] | Doubtful [Member]
Loans designated as criticized or classified	0	0
Taxi Medallion Portfolio Segment [Member] | Loss [Member]
Loans designated as criticized or classified	0	0
Commercial Business and Other Portfolio Segment [Member]
Loans designated as criticized or classified	22,997,000	25,590,000
Commercial Business and Other Portfolio Segment [Member] | Special Mention [Member]
Loans designated as criticized or classified	6,856,000	730,000
Commercial Business and Other Portfolio Segment [Member] | Substandard [Member]
Loans designated as criticized or classified	15,262,000	21,348,000
Commercial Business and Other Portfolio Segment [Member] | Doubtful [Member]
Loans designated as criticized or classified	879,000	3,512,000
Commercial Business and Other Portfolio Segment [Member] | Loss [Member]
Loans designated as criticized or classified	$ 0	$ 0