Consolidated Statements of Financial Condition (Unaudited) (Parentheticals) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Securities held to maturity, fair value	$ 40,794	$ 43,894
Loans receivable, allowance for loan losses	$ 5,275	$ 4,476
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	1,000,000	1,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	49,000,000	49,000,000
Common stock, share issued (in shares)	5,768,632	5,714,182
Common stock, share outstanding (in shares)	5,768,632	5,714,182
Unallocated common stock held by ESOP, shares (in shares)	193,144	201,316