Note 3 - Loans and Allowance for Loan Losses - Loans Modified and Classified as TDR (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014
Financing Receivable, Modifications, Number of Contracts	15	1	0
Financing Receivable, Modifications, Balance	$ 10,351	$ 41
One-To-Four Family - Mixed-Use Property Portfolio Segment [Member] | Interest Rate Below Market Reduction [Member]
Financing Receivable, Modifications, Number of Contracts	2
Financing Receivable, Modifications, Balance	$ 263
Small Business Administration Portfolio Segment [Member] | Interest Rate Below Market Reduction [Member]
Financing Receivable, Modifications, Number of Contracts		1
Financing Receivable, Modifications, Balance		$ 41
Taxi Medallion Portfolio Segment [Member] | Interest Rate Below Market Reduction [Member]
Financing Receivable, Modifications, Number of Contracts	12
Financing Receivable, Modifications, Balance	$ 9,764
Commercial Business and Other Portfolio Segment [Member] | Interest Rate Below Market Reduction [Member]
Financing Receivable, Modifications, Number of Contracts	1
Financing Receivable, Modifications, Balance	$ 324