Note 6 - Loans Held for Sale - Delinquent and Non-performing Loans Sold During the Period Indicated (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)
Nonperforming Financial Instruments [Member]
Loans sold	8	11	14	26
Proceeds	$ 2,738	$ 3,139	$ 4,863	$ 7,965
Net (charge-offs) recoveries	$ 179		(37)	(8)
Net gain		$ 240	$ 208	$ 265
Performing Financial Instruments [Member]
Loans sold	13		27	6
Proceeds	$ 30,678		$ 50,128	$ 3,534
Net (charge-offs) recoveries	$ (27)
Net gain (loss)			$ 188	$ 319
Multi-family Residential Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Loans sold	2	3	2	9
Proceeds	$ 707	$ 632	$ 707	$ 2,680
Net (charge-offs) recoveries	$ 30			(8)
Net gain		$ 1	$ 30	$ 3
Multi-family Residential Portfolio Segment [Member] | Performing Financial Instruments [Member]
Loans sold	10		8
Proceeds	$ 12,704		$ 5,061
Net (charge-offs) recoveries	$ (22)
Net gain (loss)			$ 252
Commercial Real Estate Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Loans sold	3		4	2
Proceeds	$ 1,118		$ 1,453	$ 192
Net (charge-offs) recoveries	$ 34		(4)
Net gain			$ 35
Commercial Real Estate Portfolio Segment [Member] | Performing Financial Instruments [Member]
Loans sold	2		7
Proceeds	$ 17,832		$ 26,283
Net (charge-offs) recoveries	$ (7)
Net gain (loss)			$ (28)
One-To-Four Family - Mixed-Use Property Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Loans sold	3	8	8	15
Proceeds	$ 913	$ 2,507	$ 2,703	$ 5,093
Net (charge-offs) recoveries	$ 115		(33)
Net gain		$ 239	$ 143	$ 262
Small Business Administration Portfolio Segment [Member] | Performing Financial Instruments [Member]
Loans sold	1		12	6
Proceeds	$ 142		$ 18,784	$ 3,534
Net (charge-offs) recoveries	$ 2
Net gain (loss)			$ (36)	$ 319