Consolidated Statements of Stockholders' Equity (Unaudited) (Parentheticals) - $ / shares	3 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018
Unallocated ESOP Shares [Member]
Allocation of ESOP shares (in shares)			4,695	4,695
Retained Earnings [Member]
Cash dividends paid, per share (in dollars per share)				$ 0.115
Common Stock [Member]
Shares repurchased (in shares)			15,330	50,305
Allocation of ESOP shares (in shares)	4,696	4,694
Cash dividends paid, per share (in dollars per share)	$ 0.43	$ 0.06	$ 0.05
Shares repurchased (in shares)	113,141	24,963