Note 5 - Loans - Activity in the Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Beginning balance	$ 21,510	$ 20,220	$ 20,945	$ 20,351
Charge-off's	(431)	(220)	(2,683)	(721)
Recoveries	273	309	644	526
Provision (Benefit)	683	0	3,129	153
Ending balance	22,035	20,309	22,035	20,309
Multi-family Residential Portfolio Segment [Member]
Beginning balance	5,506	5,538	5,676	5,823
Charge-off's	(189)	(18)	(190)	(99)
Recoveries	6	0	30	2
Provision (Benefit)	54	37	(139)	(169)
Ending balance	5,377	5,557	5,377	5,557
Commercial Real Estate Portfolio Segment [Member]
Beginning balance	4,265	4,726	4,315	4,643
Charge-off's	0	0	0	0
Recoveries	0	0	7	0
Provision (Benefit)	99	(650)	42	(567)
Ending balance	4,364	4,076	4,364	4,076
One-To-Four Family - Mixed-Use Property Portfolio Segment [Member]
Beginning balance	1,786	2,297	1,867	2,545
Charge-off's	0	(3)	(1)	(3)
Recoveries	140	39	228	118
Provision (Benefit)	(120)	(407)	(288)	(734)
Ending balance	1,806	1,926	1,806	1,926
One-To-Four Family - Residential Portfolio Segment [Member]
Beginning balance	746	1,003	749	1,082
Charge-off's	0	0	(113)	(1)
Recoveries	3	258	10	370
Provision (Benefit)	(4)	(382)	99	(572)
Ending balance	745	879	745	879
Construction Portfolio Segment [Member]
Beginning balance	381	264	329	68
Charge-off's	0	0	0	0
Recoveries	0	0	0	0
Provision (Benefit)	37	(2)	89	194
Ending balance	418	262	418	262
Small Business Administration Portfolio Segment [Member]
Beginning balance	382	549	418	669
Charge-off's	0	(144)	0	(196)
Recoveries	32	10	52	25
Provision (Benefit)	(57)	138	(113)	55
Ending balance	357	553	357	553
Taxi Medallion Portfolio Segment [Member]
Beginning balance	0	0	0	0
Charge-off's	0	(40)	0	(393)
Recoveries	0	0	134	0
Provision (Benefit)	0	40	(134)	393
Ending balance	0	0	0	0
Commercial Business and Other Portfolio Segment [Member]
Beginning balance	8,444	5,832	7,591	5,521
Charge-off's	(242)	(15)	(2,379)	(29)
Recoveries	92	2	183	11
Provision (Benefit)	674	1,186	3,573	1,502
Ending balance	$ 8,968	7,005	$ 8,968	7,005
Unallocated Financing Receivables [Member]
Beginning balance		11		0
Charge-off's		0		0
Recoveries		0		0
Provision (Benefit)		40		51
Ending balance		$ 51		$ 51