Note 5 - Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Mortgage Receivable [Member] \| Multi-family Residential Portfolio Segment [Member]
Recorded Investment, With no related allowance recorded	$ 5,732		$ 5,732		$ 5,742
Unpaid Principal Balance, With no related allowance recorded	6,209		6,209		6,410
Recorded Investment, With an allowance recorded	2,283		2,283		2,305
Unpaid Principal Balance, With an allowance recorded	2,283		2,283		2,305
Related Allowance	242		242		252
Multi-family residential	5,920	$ 10,281	5,861	$ 10,347
Multi-family residential	33	36	67	77
Multi-family residential	2,289	2,372	2,294	2,508
Multi-family residential	29	30	58	61
Mortgage Receivable [Member] \| Commercial Real Estate Portfolio Segment [Member]
Recorded Investment, With no related allowance recorded	4,952		4,952		3,812
Unpaid Principal Balance, With no related allowance recorded	4,980		4,980		3,869
Recorded Investment, With an allowance recorded	2,086		2,086		2,371
Unpaid Principal Balance, With an allowance recorded	2,086		2,086		2,371
Related Allowance	201		201		180
Multi-family residential	5,077	5,598	4,655	6,099
Multi-family residential	45	36	90	71
Multi-family residential	2,222	541	2,272	1,151
Multi-family residential	24	7	49	15
Mortgage Receivable [Member] \| One-To-Four Family - Mixed-Use Property Portfolio Segment [Member]
Recorded Investment, With no related allowance recorded	9,102		9,102		10,082
Unpaid Principal Balance, With no related allowance recorded	10,082		10,082		11,335
Recorded Investment, With an allowance recorded	2,503		2,503		2,746
Unpaid Principal Balance, With an allowance recorded	2,503		2,503		2,746
Related Allowance	480		480		502
Multi-family residential	2,617	3,069	2,660	3,077
Multi-family residential	34	42	68	84
Mortgage Receivable [Member] \| One-To-Four Family - Mixed Used Property [Member]
Multi-family residential	8,928	10,816	9,313	11,219
Multi-family residential	41	51	88	103
Mortgage Receivable [Member] \| One-To-Four Family - Residential Portfolio Segment [Member]
Recorded Investment, With no related allowance recorded	10,333		10,333		12,255
Unpaid Principal Balance, With no related allowance recorded	11,934		11,934		14,345
Recorded Investment, With an allowance recorded	436		436		343
Unpaid Principal Balance, With an allowance recorded	436		436		343
Related Allowance	50		50		51
Multi-family residential	10,649	13,458	11,184	13,244
Multi-family residential	25	18	52	42
Multi-family residential	389	350	373	351
Multi-family residential	4	3	7	7
Mortgage Receivable [Member] \| Co-Operative Apartments Portfolio Segment [Member]
Recorded Investment, With an allowance recorded
Unpaid Principal Balance, With an allowance recorded
Multi-family residential		307		204
Multi-family residential		5		10
Multi-family residential
Multi-family residential
Mortgage Receivable [Member] \| Construction Portfolio Segment [Member]
Recorded Investment, With no related allowance recorded	570		570		1,000
Unpaid Principal Balance, With no related allowance recorded	570		570		1,000
Recorded Investment, With an allowance recorded
Unpaid Principal Balance, With an allowance recorded
Multi-family residential	570		713
Multi-family residential	7		14
Multi-family residential
Multi-family residential
Mortgage Receivable [Member]
Related Allowance	973		973		985
Recorded Investment, Total Impaired Loans	37,997		37,997		40,656
Unpaid Principal Balance, Total Impaired Loans	41,083		41,083		44,724
Total mortgage loans	38,661	46,792	39,325	48,200
Total mortgage loans	242	228	493	470
Non-Mortgage Loans [Member] \| Small Business Administration Portfolio Segment [Member]
Recorded Investment, With no related allowance recorded	262		262		276
Unpaid Principal Balance, With no related allowance recorded	262		262		276
Recorded Investment, With an allowance recorded	676		676		34
Unpaid Principal Balance, With an allowance recorded	676		676		34
Related Allowance	412		412
Multi-family residential	257	314	263	209
Multi-family residential	3	3	6	6
Multi-family residential	413	40	287	27
Multi-family residential	10	1	19	1
Non-Mortgage Loans [Member] \| Taxi Medallion Portflio Segment [Member]
Recorded Investment, With no related allowance recorded
Recorded Investment, With an allowance recorded	6,364		6,364		2,118
Unpaid Principal Balance, With an allowance recorded	6,364		6,364		2,118
Related Allowance	1,035		1,035		333
Multi-family residential
Multi-family residential
Multi-family residential	4,237		3,531
Multi-family residential	44		88
Non-Mortgage Loans [Member] \| Commercial Business and Other Portfolio Segment [Member]
Recorded Investment, With no related allowance recorded	2,252		2,252		2,682
Unpaid Principal Balance, With no related allowance recorded	2,622		2,622		5,347
Recorded Investment, With an allowance recorded	457		457		2,034
Unpaid Principal Balance, With an allowance recorded	457		457		2,034
Related Allowance	1		1		112
Multi-family residential	2,313	4,607	2,436	3,997
Multi-family residential	46	49	93	100
Multi-family residential	1,225	2,584	1,494	2,627
Multi-family residential	7	35	14	69
Non-Mortgage Loans [Member]
Related Allowance	1,448		1,448		445
Recorded Investment, Total Impaired Loans	10,011		10,011		7,144
Unpaid Principal Balance, Total Impaired Loans	10,381		10,381		9,809
Total mortgage loans	8,445	7,545	8,011	6,860
Total mortgage loans	110	88	220	176
Multi-family Residential Portfolio Segment [Member]
Recorded Investment, Total Impaired Loans	13,094		13,094		9,782
Commercial Real Estate Portfolio Segment [Member]
Recorded Investment, Total Impaired Loans	6,504		6,504		5,633
One-To-Four Family - Mixed-Use Property Portfolio Segment [Member]
Recorded Investment, Total Impaired Loans	13,582		13,582		14,077
One-To-Four Family - Residential Portfolio Segment [Member]
Recorded Investment, Total Impaired Loans	11,777		11,777		13,692
Co-Operative Apartments Portfolio Segment [Member]
Recorded Investment, Total Impaired Loans
Construction Portfolio Segment [Member]
Recorded Investment, Total Impaired Loans	1,146		1,146		1,000
Small Business Administration Portfolio Segment [Member]
Recorded Investment, Total Impaired Loans	1,424		1,424		453
Taxi Medallion Portflio Segment [Member]
Recorded Investment, Total Impaired Loans	6,364		6,364		2,118
Commercial Business and Other Portfolio Segment [Member]
Recorded Investment, Total Impaired Loans	3,440		3,440		3,123
Recorded Investment, With no related allowance recorded	33,203		33,203		35,849
Unpaid Principal Balance, With no related allowance recorded	36,659		36,659		42,582
Recorded Investment, With an allowance recorded	14,805		14,805		11,951
Unpaid Principal Balance, With an allowance recorded	14,805		14,805		11,951
Related Allowance	2,421		2,421		1,430
Recorded Investment, Total Impaired Loans	57,331		57,331		$ 49,878
Multi-family residential	33,714	45,381	34,425	45,319
Multi-family residential	200	198	410	409
Multi-family residential	13,392	8,956	12,911	9,741
Multi-family residential	$ 152	$ 118	$ 303	$ 237

Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5212-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5258-111524

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=65880944

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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