Consolidated Statements of Stockholders' Equity (Parentheticals) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Unallocated ESOP Shares [Member]
Allocation of ESOP shares (in shares)	18,780	18,779
Retained Earnings [Member]
Cash dividends paid, per share (in dollars per share)	$ 0.629	$ 0.265
Common Stock [Member]
Shares repurchased (in shares)	204,448	118,621
Grant of MRP shares, shares (in shares)	2,520	5,250