Note 4 - Loans Held for Sale (Details) - Delinquent and Non-Performing Loans Sold During the Period $ in Thousands	12 Months Ended
Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Note 4 - Loans Held for Sale (Details) - Delinquent and Non-Performing Loans Sold During the Period [Line Items]
Loans sold	23	34	72
Proceeds	$ 8,986	$ 15,857	$ 33,401
Net (charge-offs) recoveries	134	357	(4,703)
Net gain (loss)	$ 69	$ 67	$ 53
Multi-family Residential Portfolio Segment [Member]
Note 4 - Loans Held for Sale (Details) - Delinquent and Non-Performing Loans Sold During the Period [Line Items]
Loans sold	9	12	21
Proceeds	$ 3,540	$ 5,759	$ 11,420
Net (charge-offs) recoveries	134	(80)	(1,024)
Net gain (loss)	$ (1)	$ 9	$ 99
Commercial Real Estate Portfolio Segment [Member]
Note 4 - Loans Held for Sale (Details) - Delinquent and Non-Performing Loans Sold During the Period [Line Items]
Loans sold	4	6	9
Proceeds	$ 2,615	$ 4,635	$ 5,488
Net (charge-offs) recoveries		295	(703)
Net gain (loss)	$ 13	$ 8	$ 6
One-to-Four Family - Mixed-Use Property Portfolio Segment [Member]
Note 4 - Loans Held for Sale (Details) - Delinquent and Non-Performing Loans Sold During the Period [Line Items]
Loans sold	10	14	39
Proceeds	$ 2,831	$ 5,399	$ 11,427
Net (charge-offs) recoveries		122	(2,791)
Net gain (loss)	$ 57	$ 50	$ (52)
Commercial Business and Other Portfolio Segment [Member]
Note 4 - Loans Held for Sale (Details) - Delinquent and Non-Performing Loans Sold During the Period [Line Items]
Loans sold		2	1
Proceeds		$ 64
Net (charge-offs) recoveries		$ 20	$ (21)
Construction Portfolio Segment [Member]
Note 4 - Loans Held for Sale (Details) - Delinquent and Non-Performing Loans Sold During the Period [Line Items]
Loans sold			2
Proceeds			$ 5,066
Net (charge-offs) recoveries			$ (164)