Note 5 - Loans - Loans Designated as Criticized or Classified (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Loans designated as criticized or classified	$ 48,540	$ 53,030
Special Mention [Member]
Loans designated as criticized or classified	17,490	6,576
Substandard [Member]
Loans designated as criticized or classified	30,609	42,942
Doubtful [Member]
Loans designated as criticized or classified	441	3,512
Loss [Member]
Loans designated as criticized or classified	0	0
Multi-family Residential Portfolio Segment [Member]
Loans designated as criticized or classified	5,710	6,664
Multi-family Residential Portfolio Segment [Member] | Special Mention [Member]
Loans designated as criticized or classified	1,954	2,498
Multi-family Residential Portfolio Segment [Member] | Substandard [Member]
Loans designated as criticized or classified	3,756	4,166
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	10,538	4,432
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member]
Loans designated as criticized or classified	8,999	381
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member]
Loans designated as criticized or classified	1,539	4,051
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	3,004	3,233
One-To-Four Family - Mixed-Use Property Portfolio Segment [Member] | Special Mention [Member]
Loans designated as criticized or classified	1,789	1,199
One-To-Four Family - Mixed-Use Property Portfolio Segment [Member] | Substandard [Member]
Loans designated as criticized or classified	1,215	2,034
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	6,063	7,222
One-To-Four Family - Residential Portfolio Segment [Member] | Special Mention [Member]
Loans designated as criticized or classified	295	557
One-To-Four Family - Residential Portfolio Segment [Member] | Substandard [Member]
Loans designated as criticized or classified	5,768	6,665
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
Construction Portfolio Segment [Member] | Special Mention [Member]
Loans designated as criticized or classified	0	730
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	140	620
Small Business Administration Portfolio Segment [Member] | Special Mention [Member]
Loans designated as criticized or classified	55	481
Small Business Administration Portfolio Segment [Member] | Substandard [Member]
Loans designated as criticized or classified	85	139
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	3,513	4,539
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	3,513	4,539
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	19,572	25,590
Commercial Business and Other Portfolio Segment [Member] | Special Mention [Member]
Loans designated as criticized or classified	4,398	730
Commercial Business and Other Portfolio Segment [Member] | Substandard [Member]
Loans designated as criticized or classified	14,733	21,348
Commercial Business and Other Portfolio Segment [Member] | Doubtful [Member]
Loans designated as criticized or classified	441	3,512
Commercial Business and Other Portfolio Segment [Member] | Loss [Member]
Loans designated as criticized or classified	$ 0	$ 0