Note 5 - Loans - Activity in the Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Beginning balance		$ 20,351
Charge-off's		(85)
Recoveries		123
Provision (Benefit)		153
Ending balance		20,542
Multi-family Residential Portfolio Segment [Member]
Beginning balance	$ 5,676	5,823
Charge-off's		(53)
Recoveries	13	2
Provision (Benefit)	(196)	(22)
Ending balance	5,493	5,750
Commercial Real Estate Portfolio Segment [Member]
Beginning balance	4,315	4,643
Charge-off's
Recoveries
Provision (Benefit)	(37)	(41)
Ending balance	4,278	4,602
One-To-Four Family - Mixed-Use Property Portfolio Segment [Member]
Beginning balance	1,867	2,545
Charge-off's	(1)
Recoveries	86
Provision (Benefit)	(161)	(75)
Ending balance	1,791	2,470
One-To-Four Family - Residential Portfolio Segment [Member]
Beginning balance	749	1,082
Charge-off's		(1)
Recoveries	4	108
Provision (Benefit)	(22)	(148)
Ending balance	731	1,041
Co-Operative Apartments Portfolio Segment [Member]
Beginning balance	329
Charge-off's
Recoveries
Provision (Benefit)	22
Ending balance	351
Construction Portfolio Segment [Member]
Beginning balance	418	68
Charge-off's
Recoveries	4
Provision (Benefit)	(13)	123
Ending balance	409	191
Small Business Administration Portfolio Segment [Member]
Beginning balance		669
Charge-off's		(25)
Recoveries	84	6
Provision (Benefit)	(84)	25
Ending balance		675
Taxi Medallion Portfolio Segment [Member]
Beginning balance	7,591
Charge-off's	(1,137)
Recoveries	45
Provision (Benefit)	1,463
Ending balance	7,962
Commercial Business and Other Portfolio Segment [Member]
Beginning balance	20,945	5,521
Charge-off's	(1,138)	(6)
Recoveries	236	7
Provision (Benefit)	972	291
Ending balance	$ 21,015	$ 5,813