Note 5 - Age Analysis of Recorded Investment in Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Multi-family Residential Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Past due	$ 4,706	$ 9,421
Multi-family Residential Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Past due	363	804
Multi-family Residential Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Past due	3,737	3,794
Multi-family Residential Portfolio Segment [Member]
Past due	8,806	14,019
Current	2,150,332	2,041,209
Total Loans	2,159,138	2,055,228
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Past due	2,405	2,820
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Past due	987	153
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Past due	2,619	3,580
Commercial Real Estate Portfolio Segment [Member]
Past due	6,011	6,553
Current	1,140,389	994,683
Total Loans	1,146,400	1,001,236
One-To-Four Family - Mixed-Use Property Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Past due	4,417	8,630
One-To-Four Family - Mixed-Use Property Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Past due	1,025	1,258
One-To-Four Family - Mixed-Use Property Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Past due	6,640	6,563
One-To-Four Family - Mixed-Use Property Portfolio Segment [Member]
Past due	12,082	16,451
Current	554,620	556,592
Total Loans	566,702	573,043
One-To-Four Family - Residential Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Past due	1,518	4,261
One-To-Four Family - Residential Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Past due	527	154
One-To-Four Family - Residential Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Past due	8,221	10,134
One-To-Four Family - Residential Portfolio Segment [Member]
Past due	10,266	14,549
Current	179,985	173,289
Total Loans	190,251	187,838
Co-Operative Apartments Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Past due
Co-Operative Apartments Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Past due
Co-Operative Apartments Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Past due
Co-Operative Apartments Portfolio Segment [Member]
Past due
Current	7,571	8,285
Total Loans	7,571	8,285
Construction Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Past due
Construction Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Past due	576
Construction Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Past due		1,000
Construction Portfolio Segment [Member]
Past due	576	1,000
Current	9,323	6,284
Total Loans	9,899	7,284
Small Business Administration Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Past due	2,435	42
Small Business Administration Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Past due	119
Small Business Administration Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Past due	80	218
Small Business Administration Portfolio Segment [Member]
Past due	2,634	260
Current	12,084	11,934
Total Loans	14,718	12,194
Taxi Medallion Portflio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Past due	3,767
Taxi Medallion Portflio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Past due
Taxi Medallion Portflio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Past due	196
Taxi Medallion Portflio Segment [Member]
Past due	3,963
Current	16,678	20,881
Total Loans	20,641	20,881
Commercial Business and Other Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Past due	3,012
Commercial Business and Other Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Past due	12	2
Commercial Business and Other Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Past due		228
Commercial Business and Other Portfolio Segment [Member]
Past due	3,024	230
Current	561,060	506,392
Total Loans	564,084	506,622
Financing Receivables, 30 to 59 Days Past Due [Member]
Past due	22,260	25,174
Financing Receivables, 60 to 89 Days Past Due [Member]
Past due	3,609	2,371
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Past due	21,493	25,517
Past due	47,362	53,062
Current	4,632,042	4,319,549
Total Loans	$ 4,679,404	$ 4,372,611