Note 5 - Loans - Troubled Debt Restructurings That are Performing According to Their Restructured Terms (Details) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2016 USD ($)	Sep. 30, 2015	Sep. 30, 2016 USD ($)	Sep. 30, 2015	Dec. 31, 2015 USD ($)
Multi-Family Residential [Member] | Performing Financial Instruments [Member]
Financing Receivable, Modifications, Number of Contracts			9		9
Recorded investment	$ 2,586		$ 2,586		$ 2,626
Commercial Real Estate Loans [Member] | Performing Financial Instruments [Member]
Financing Receivable, Modifications, Number of Contracts			2		3
Recorded investment	2,074		$ 2,074		$ 2,371
One-To-Four Family - Mixed Used Property [Member] | Performing Financial Instruments [Member]
Financing Receivable, Modifications, Number of Contracts			5		6
Recorded investment	1,809		$ 1,809		$ 2,052
One-To-Four Family - Residential [Member] | Performing Financial Instruments [Member]
Financing Receivable, Modifications, Number of Contracts			3		1
Recorded investment	596		$ 596		$ 343
Small Business Administration Portfolio Segment [Member] | Performing Financial Instruments [Member]
Financing Receivable, Modifications, Number of Contracts					1
Recorded investment					$ 34
Commercial Business and Other [Member] | Performing Financial Instruments [Member]
Financing Receivable, Modifications, Number of Contracts			3		4
Recorded investment	1,139		$ 1,139		$ 2,083
Performing Financial Instruments [Member]
Financing Receivable, Modifications, Number of Contracts			22		24
Recorded investment	$ 8,204		$ 8,204		$ 9,509
Financing Receivable, Modifications, Number of Contracts	0	0	4	1