Note 5 - Loans - Activity in the Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Allowance for credit losses:
Beginning balance	$ 20,542	$ 22,211	$ 20,351	$ 22,229
Charge-off's	(416)	(350)	(501)	(529)
Recoveries	94	296	217	457
Provision (Benefit)			153
Ending balance	20,220	22,157	20,220	22,157
Multi-family Residential Portfolio Segment [Member]
Allowance for credit losses:
Beginning balance	5,750	5,907	5,823	5,923
Charge-off's	(28)	(148)	(81)	(162)
Recoveries		201	2	231
Provision (Benefit)	(184)	(43)	(206)	(75)
Ending balance	5,538	5,917	5,538	5,917
Commercial Real Estate Portfolio Segment [Member]
Allowance for credit losses:
Beginning balance	4,602	4,485	4,643	4,487
Charge-off's		(4)		(4)
Recoveries				68
Provision (Benefit)	124	207	83	137
Ending balance	4,726	4,688	4,726	4,688
One-To-Four Family - Mixed-Use Property Portfolio Segment [Member]
Allowance for credit losses:
Beginning balance	2,470	2,691	2,545	2,903
Charge-off's		(1)		(35)
Recoveries	79	68	79	68
Provision (Benefit)	(252)	(190)	(327)	(368)
Ending balance	2,297	2,568	2,297	2,568
One-To-Four Family - Residential Portfolio Segment [Member]
Allowance for credit losses:
Beginning balance	1,041	979	1,082	1,015
Charge-off's		(170)	(1)	(170)
Recoveries	4		112
Provision (Benefit)	(42)	181	(190)	145
Ending balance	1,003	990	1,003	990
Construction Portfolio Segment [Member]
Allowance for credit losses:
Beginning balance	191	94	68	92
Charge-off's	0	0
Recoveries	0	0
Provision (Benefit)	73	36	196	38
Ending balance	264	130	264	130
Small Business Administration Portfolio Segment [Member]
Allowance for credit losses:
Beginning balance	675	315	669	481
Charge-off's	(27)	(24)	(52)	(89)
Recoveries	9	10	15	49
Provision (Benefit)	(108)	5	(83)	(135)
Ending balance	549	306	549	306
Taxi Medallion Portfolio Segment [Member]
Allowance for credit losses:
Beginning balance		2,213		2,243
Charge-off's	(353)		(353)	(54)
Recoveries
Provision (Benefit)	353	117	353	141
Ending balance		2,330		2,330
Commercial Business and Other Portfolio Segment [Member]
Allowance for credit losses:
Beginning balance	5,813	4,712	5,521	4,492
Charge-off's	(8)	(3)	(14)	(15)
Recoveries	2	17	9	41
Provision (Benefit)	25	(58)	316	150
Ending balance	5,832	4,668	5,832	4,668
Unallocated Financing Receivables [Member]
Allowance for credit losses:
Beginning balance		815		593
Charge-off's
Recoveries
Provision (Benefit)	11	(255)	11	(33)
Ending balance	$ 11	$ 560	$ 11	$ 560